21222232031 has 16 divisors (see below), whose sum is σ = 28494187008. Its totient is φ = 15264741600.

The previous prime is 21222232027. The next prime is 21222232051. The reversal of 21222232031 is 13023222212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21222232031 - 2² = 21222232027 is a prime.

It is a super-2 number, since 2×21222232031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21222231994 and 21222232012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222232021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10599515 + ... + 10601516.

It is an arithmetic number, because the mean of its divisors is an integer number (1780886688).

Almost surely, 2^21222232031 is an apocalyptic number.

21222232031 is a deficient number, since it is larger than the sum of its proper divisors (7271954977).

21222232031 is a wasteful number, since it uses less digits than its factorization.

21222232031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21201062.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21222232031 its reverse (13023222212), we get a palindrome (34245454243).

The spelling of 21222232031 in words is "twenty-one billion, two hundred twenty-two million, two hundred thirty-two thousand, thirty-one".