21874670 has 16 divisors (see below), whose sum is σ = 39497328. Its totient is φ = 8722560.

The previous prime is 21874627. The next prime is 21874673. The reversal of 21874670 is 7647812.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21874670.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21874673) 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, 125 + ... + 6615.

It is an arithmetic number, because the mean of its divisors is an integer number (2468583).

Almost surely, 2^21874670 is an apocalyptic number.

21874670 is a deficient number, since it is larger than the sum of its proper divisors (17622658).

21874670 is a wasteful number, since it uses less digits than its factorization.

21874670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6835.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 21874670 is about 4677.0364548504. The cubic root of 21874670 is about 279.6708291615.

The spelling of 21874670 in words is "twenty-one million, eight hundred seventy-four thousand, six hundred seventy".