21010021012 has 48 divisors (see below), whose sum is σ = 37364326272. Its totient is φ = 10336435200.

The previous prime is 21010020991. The next prime is 21010021027. The reversal of 21010021012 is 21012001012.

It is a self number, because there is not a number n which added to its sum of digits gives 21010021012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47426463 + ... + 47426905.

It is an arithmetic number, because the mean of its divisors is an integer number (778423464).

Almost surely, 2^21010021012 is an apocalyptic number.

It is an amenable number.

21010021012 is a deficient number, since it is larger than the sum of its proper divisors (16354305260).

21010021012 is a wasteful number, since it uses less digits than its factorization.

21010021012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1168 (or 1166 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21010021012 its reverse (21012001012), we get a palindrome (42022022024).

The spelling of 21010021012 in words is "twenty-one billion, ten million, twenty-one thousand, twelve".