21122211012 has 48 divisors (see below), whose sum is σ = 56755894272. Its totient is φ = 5988846240.

The previous prime is 21122210971. The next prime is 21122211049. The reversal of 21122211012 is 21011222112.

It is a super-2 number, since 2×21122211012² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21122210982 and 21122211000.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 948748 + ... + 970755.

It is an arithmetic number, because the mean of its divisors is an integer number (1182414464).

Almost surely, 2^21122211012 is an apocalyptic number.

It is an amenable number.

21122211012 is an abundant number, since it is smaller than the sum of its proper divisors (35633683260).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21122211012 is a wasteful number, since it uses less digits than its factorization.

21122211012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1919648 (or 1919646 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21122211012 its reverse (21011222112), we get a palindrome (42133433124).

The spelling of 21122211012 in words is "twenty-one billion, one hundred twenty-two million, two hundred eleven thousand, twelve".