21670754 has 32 divisors (see below), whose sum is σ = 39381120. Its totient is φ = 8736768.

The previous prime is 21670741. The next prime is 21670763. The reversal of 21670754 is 45707612.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21670754.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68204 + ... + 68520.

It is an arithmetic number, because the mean of its divisors is an integer number (1230660).

Almost surely, 2^21670754 is an apocalyptic number.

21670754 is a deficient number, since it is larger than the sum of its proper divisors (17710366).

21670754 is a wasteful number, since it uses less digits than its factorization.

21670754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602.

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 21670754 is about 4655.1857105813. The cubic root of 21670754 is about 278.7990828327.

The spelling of 21670754 in words is "twenty-one million, six hundred seventy thousand, seven hundred fifty-four".