1222000001221 has 8 divisors (see below), whose sum is σ = 1293948451224. Its totient is φ = 1150058895360.

The previous prime is 1222000001219. The next prime is 1222000001267. The reversal of 1222000001221 is 1221000002221.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 595195277121 + 626804724100 = 771489^2 + 791710^2 .

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 1222000001221 - 2¹ = 1222000001219 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 (1222000001281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1491610 + ... + 2160763.

It is an arithmetic number, because the mean of its divisors is an integer number (161743556403).

Almost surely, 2^{1222000001221} is an apocalyptic number.

It is an amenable number.

1222000001221 is a deficient number, since it is larger than the sum of its proper divisors (71948450003).

1222000001221 is a wasteful number, since it uses less digits than its factorization.

1222000001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3672071.

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

Adding to 1222000001221 its reverse (1221000002221), we get a palindrome (2443000003442).

The spelling of 1222000001221 in words is "one trillion, two hundred twenty-two billion, one thousand, two hundred twenty-one".