21012421012 has 18 divisors (see below), whose sum is σ = 40418521514. Its totient is φ = 9551100240.

The previous prime is 21012421007. The next prime is 21012421037.

21012421012 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 20910895236 + 101525776 = 144606^2 + 10076^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21706563 + ... + 21707530.

Almost surely, 2^21012421012 is an apocalyptic number.

21012421012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21012421012 is a deficient number, since it is larger than the sum of its proper divisors (19406100502).

21012421012 is a wasteful number, since it uses less digits than its factorization.

21012421012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43414119 (or 43414106 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The spelling of 21012421012 in words is "twenty-one billion, twelve million, four hundred twenty-one thousand, twelve".