21063012 has 48 divisors (see below), whose sum is σ = 52007424. Its totient is φ = 6624000.

The previous prime is 21062999. The next prime is 21063013. The reversal of 21063012 is 21036012.

21063012 = 159² + 160² + ... + 406².

It is a junction number, because it is equal to n+sod(n) for n = 21062982 and 21063000.

It is not an unprimeable number, because it can be changed into a prime (21063013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14562 + ... + 15942.

It is an arithmetic number, because the mean of its divisors is an integer number (1083488).

Almost surely, 2^21063012 is an apocalyptic number.

It is an amenable number.

21063012 is an abundant number, since it is smaller than the sum of its proper divisors (30944412).

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

21063012 is a wasteful number, since it uses less digits than its factorization.

21063012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1460 (or 1458 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 21063012 is about 4589.4457181668. The cubic root of 21063012 is about 276.1680870683.

Adding to 21063012 its reverse (21036012), we get a palindrome (42099024).

Subtracting from 21063012 its reverse (21036012), we obtain a cube (27000 = 30³).

The spelling of 21063012 in words is "twenty-one million, sixty-three thousand, twelve".