22121020331 has 4 divisors (see below), whose sum is σ = 22834601664. Its totient is φ = 21407439000.

The previous prime is 22121020307. The next prime is 22121020343. The reversal of 22121020331 is 13302012122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22121020331 is a prime.

It is a super-2 number, since 2×22121020331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22121020231) 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, 356790620 + ... + 356790681.

It is an arithmetic number, because the mean of its divisors is an integer number (5708650416).

Almost surely, 2^22121020331 is an apocalyptic number.

22121020331 is a deficient number, since it is larger than the sum of its proper divisors (713581333).

22121020331 is an equidigital number, since it uses as much as digits as its factorization.

22121020331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713581332.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 22121020331 its reverse (13302012122), we get a palindrome (35423032453).

The spelling of 22121020331 in words is "twenty-two billion, one hundred twenty-one million, twenty thousand, three hundred thirty-one".