21740612 has 24 divisors (see below), whose sum is σ = 39868416. Its totient is φ = 10353728.

The previous prime is 21740611. The next prime is 21740623. The reversal of 21740612 is 21604712.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is not an unprimeable number, because it can be changed into a prime (21740611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34928 + ... + 35544.

It is an arithmetic number, because the mean of its divisors is an integer number (1661184).

Almost surely, 2^21740612 is an apocalyptic number.

It is an amenable number.

21740612 is a deficient number, since it is larger than the sum of its proper divisors (18127804).

21740612 is a wasteful number, since it uses less digits than its factorization.

21740612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1027 (or 1025 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 21740612 is about 4662.6829186639. The cubic root of 21740612 is about 279.0983410818.

The spelling of 21740612 in words is "twenty-one million, seven hundred forty thousand, six hundred twelve".