21275012 has 12 divisors (see below), whose sum is σ = 40616016. Its totient is φ = 9670440.

The previous prime is 21274999. The next prime is 21275017. The reversal of 21275012 is 21057212.

It is a super-2 number, since 2×21275012² = 905252271200288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21275017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 241718 + ... + 241805.

It is an arithmetic number, because the mean of its divisors is an integer number (3384668).

Almost surely, 2^21275012 is an apocalyptic number.

21275012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21275012 is a deficient number, since it is larger than the sum of its proper divisors (19341004).

21275012 is a wasteful number, since it uses less digits than its factorization.

21275012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483538 (or 483536 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 21275012 is about 4612.4843631171. The cubic root of 21275012 is about 277.0915431164.

The spelling of 21275012 in words is "twenty-one million, two hundred seventy-five thousand, twelve".