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20222221 = 23879227
BaseRepresentation
bin100110100100…
…1000100001101
31102001101200011
41031021010031
520134102341
62001233221
7333612625
oct115110415
942041604
1020222221
1110462288
126932811
134260616
142985885
151b96b81
hex134910d

20222221 has 4 divisors (see below), whose sum is σ = 21101472. Its totient is φ = 19342972.

The previous prime is 20222219. The next prime is 20222227. The reversal of 20222221 is 12222202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20222221 - 21 = 20222219 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 (20222227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 439591 + ... + 439636.

It is an arithmetic number, because the mean of its divisors is an integer number (5275368).

Almost surely, 220222221 is an apocalyptic number.

It is an amenable number.

20222221 is a deficient number, since it is larger than the sum of its proper divisors (879251).

20222221 is an equidigital number, since it uses as much as digits as its factorization.

20222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879250.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 20222221 is about 4496.9123851816. The cubic root of 20222221 is about 272.4433953633.

Adding to 20222221 its reverse (12222202), we get a palindrome (32444423).

The spelling of 20222221 in words is "twenty million, two hundred twenty-two thousand, two hundred twenty-one".

Divisors: 1 23 879227 20222221