21021011012 has 12 divisors (see below), whose sum is σ = 36793214976. Its totient is φ = 10508663880.

The previous prime is 21021010961. The next prime is 21021011027. The reversal of 21021011012 is 21011012012.

It is a junction number, because it is equal to n+sod(n) for n = 21021010984 and 21021011002.

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, 434564 + ... + 480507.

It is an arithmetic number, because the mean of its divisors is an integer number (3066101248).

Almost surely, 2^21021011012 is an apocalyptic number.

It is an amenable number.

21021011012 is a deficient number, since it is larger than the sum of its proper divisors (15772203964).

21021011012 is a wasteful number, since it uses less digits than its factorization.

21021011012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920818 (or 920816 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21021011012 its reverse (21011012012), we get a palindrome (42032023024).

The spelling of 21021011012 in words is "twenty-one billion, twenty-one million, eleven thousand, twelve".