21211333012 has 48 divisors (see below), whose sum is σ = 39315931200. Its totient is φ = 9985317120.

The previous prime is 21211332997. The next prime is 21211333057. The reversal of 21211333012 is 21033311212.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

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, 14537539 + ... + 14538997.

It is an arithmetic number, because the mean of its divisors is an integer number (819081900).

Almost surely, 2^21211333012 is an apocalyptic number.

It is an amenable number.

21211333012 is a deficient number, since it is larger than the sum of its proper divisors (18104598188).

21211333012 is a wasteful number, since it uses less digits than its factorization.

21211333012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2536 (or 2534 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21211333012 its reverse (21033311212), we get a palindrome (42244644224).

The spelling of 21211333012 in words is "twenty-one billion, two hundred eleven million, three hundred thirty-three thousand, twelve".