21012133076 has 96 divisors (see below), whose sum is σ = 43113627648. Its totient is φ = 8854709760.

The previous prime is 21012133031. The next prime is 21012133097. The reversal of 21012133076 is 67033121012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17180201 + ... + 17181423.

It is an arithmetic number, because the mean of its divisors is an integer number (449100288).

Almost surely, 2^21012133076 is an apocalyptic number.

It is an amenable number.

21012133076 is an abundant number, since it is smaller than the sum of its proper divisors (22101494572).

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

21012133076 is a wasteful number, since it uses less digits than its factorization.

21012133076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1581 (or 1579 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

Adding to 21012133076 its reverse (67033121012), we get a palindrome (88045254088).

The spelling of 21012133076 in words is "twenty-one billion, twelve million, one hundred thirty-three thousand, seventy-six".