222121531421 has 32 divisors (see below), whose sum is σ = 239785958400. Its totient is φ = 205334922240.

The previous prime is 222121531399. The next prime is 222121531477. The reversal of 222121531421 is 124135121222.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222121531421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222121536421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68280431 + ... + 68283683.

It is an arithmetic number, because the mean of its divisors is an integer number (7493311200).

Almost surely, 2^222121531421 is an apocalyptic number.

It is an amenable number.

222121531421 is a deficient number, since it is larger than the sum of its proper divisors (17664426979).

222121531421 is a wasteful number, since it uses less digits than its factorization.

222121531421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4389.

The product of its digits is 1920, while the sum is 26.

Adding to 222121531421 its reverse (124135121222), we get a palindrome (346256652643).

The spelling of 222121531421 in words is "two hundred twenty-two billion, one hundred twenty-one million, five hundred thirty-one thousand, four hundred twenty-one".