21396654 has 24 divisors (see below), whose sum is σ = 46486440. Its totient is φ = 7112688.

The previous prime is 21396649. The next prime is 21396667. The reversal of 21396654 is 45669312.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6124 + ... + 8960.

It is an arithmetic number, because the mean of its divisors is an integer number (1936935).

Almost surely, 2^21396654 is an apocalyptic number.

21396654 is an abundant number, since it is smaller than the sum of its proper divisors (25089786).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21396654 is a wasteful number, since it uses less digits than its factorization.

21396654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3264 (or 3261 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 21396654 is about 4625.6517378635. The cubic root of 21396654 is about 277.6186393124.

The spelling of 21396654 in words is "twenty-one million, three hundred ninety-six thousand, six hundred fifty-four".