21277012 has 12 divisors (see below), whose sum is σ = 37267776. Its totient is φ = 10629080.

The previous prime is 21277007. The next prime is 21277021. The reversal of 21277012 is 21077212.

It is a super-2 number, since 2×21277012² = 905422479296288, which contains 22 as substring.

It is a congruent number.

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, 6063 + ... + 8905.

It is an arithmetic number, because the mean of its divisors is an integer number (3105648).

Almost surely, 2^21277012 is an apocalyptic number.

It is an amenable number.

21277012 is a deficient number, since it is larger than the sum of its proper divisors (15990764).

21277012 is a wasteful number, since it uses less digits than its factorization.

21277012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4718 (or 4716 counting only the distinct ones).

The product of its (nonzero) digits is 392, while the sum is 22.

The square root of 21277012 is about 4612.7011609251. The cubic root of 21277012 is about 277.1002256923.

The spelling of 21277012 in words is "twenty-one million, two hundred seventy-seven thousand, twelve".