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1221000020221 = 19143894466131
BaseRepresentation
bin10001110001001001010…
…001011100000011111101
311022201121120221200002011
4101301021101130003331
5130001102001121341
62332530351531221
7154133342633542
oct21611121340375
94281546850064
101221000020221
11430906753103
1217877a529b11
138b1a8208a87
144314d564bc9
1521b6363db81
hex11c4945c0fd

1221000020221 has 8 divisors (see below), whose sum is σ = 1285352789600. Its totient is φ = 1156656211920.

The previous prime is 1221000020209. The next prime is 1221000020263. The reversal of 1221000020221 is 1220200001221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221000020221 - 25 = 1221000020189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221000020281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1959675 + ... + 2506456.

It is an arithmetic number, because the mean of its divisors is an integer number (160669098700).

Almost surely, 21221000020221 is an apocalyptic number.

It is an amenable number.

1221000020221 is a deficient number, since it is larger than the sum of its proper divisors (64352769379).

1221000020221 is a wasteful number, since it uses less digits than its factorization.

1221000020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4480539.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1221000020221 its reverse (1220200001221), we get a palindrome (2441200021442).

The spelling of 1221000020221 in words is "one trillion, two hundred twenty-one billion, twenty thousand, two hundred twenty-one".

Divisors: 1 19 14389 273391 4466131 84856489 64263158959 1221000020221