21345712 has 10 divisors (see below), whose sum is σ = 41357348. Its totient is φ = 10672848.

The previous prime is 21345703. The next prime is 21345713. The reversal of 21345712 is 21754312.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21345713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 667038 + ... + 667069.

Almost surely, 2^21345712 is an apocalyptic number.

It is an amenable number.

21345712 is a deficient number, since it is larger than the sum of its proper divisors (20011636).

21345712 is a wasteful number, since it uses less digits than its factorization.

21345712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1334115 (or 1334109 counting only the distinct ones).

The product of its digits is 1680, while the sum is 25.

The square root of 21345712 is about 4620.1419891601. The cubic root of 21345712 is about 277.3981424187.

The spelling of 21345712 in words is "twenty-one million, three hundred forty-five thousand, seven hundred twelve".