21211214012 has 12 divisors (see below), whose sum is σ = 37149116760. Its totient is φ = 10597180656.

The previous prime is 21211213993. The next prime is 21211214027. The reversal of 21211214012 is 21041211212.

It is a super-2 number, since 2×21211214012² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2100923 + ... + 2110994.

It is an arithmetic number, because the mean of its divisors is an integer number (3095759730).

Almost surely, 2^21211214012 is an apocalyptic number.

It is an amenable number.

21211214012 is a deficient number, since it is larger than the sum of its proper divisors (15937902748).

21211214012 is a wasteful number, since it uses less digits than its factorization.

21211214012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4213180 (or 4213178 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21211214012 its reverse (21041211212), we get a palindrome (42252425224).

The spelling of 21211214012 in words is "twenty-one billion, two hundred eleven million, two hundred fourteen thousand, twelve".