21330711 has 24 divisors (see below), whose sum is σ = 32864000. Its totient is φ = 13293072.

The previous prime is 21330679. The next prime is 21330737. The reversal of 21330711 is 11703312.

It is not a de Polignac number, because 21330711 - 2⁵ = 21330679 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21330761) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12720 + ... + 14298.

Almost surely, 2^21330711 is an apocalyptic number.

21330711 is a deficient number, since it is larger than the sum of its proper divisors (11533289).

21330711 is a wasteful number, since it uses less digits than its factorization.

21330711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1683 (or 1680 counting only the distinct ones).

The product of its (nonzero) digits is 126, while the sum is 18.

The square root of 21330711 is about 4618.5182688823. The cubic root of 21330711 is about 277.3331453722. Note that the first 3 decimals are identical.

The spelling of 21330711 in words is "twenty-one million, three hundred thirty thousand, seven hundred eleven".