21202111012 has 48 divisors (see below), whose sum is σ = 37727592448. Its totient is φ = 10424816640.

The previous prime is 21202110977. The next prime is 21202111031. The reversal of 21202111012 is 21011120212.

It is a super-2 number, since 2×21202111012² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21202110983 and 21202111001.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46393888 + ... + 46394344.

Almost surely, 2^21202111012 is an apocalyptic number.

It is an amenable number.

21202111012 is a deficient number, since it is larger than the sum of its proper divisors (16525481436).

21202111012 is a wasteful number, since it uses less digits than its factorization.

21202111012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1196 (or 1194 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21202111012 its reverse (21011120212), we get a palindrome (42213231224).

The spelling of 21202111012 in words is "twenty-one billion, two hundred two million, one hundred eleven thousand, twelve".