21889470 has 16 divisors (see below), whose sum is σ = 52534800. Its totient is φ = 5837184.

The previous prime is 21889453. The next prime is 21889487. The reversal of 21889470 is 7498812.

It is an interprime number because it is at equal distance from previous prime (21889453) and next prime (21889487).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 364795 + ... + 364854.

It is an arithmetic number, because the mean of its divisors is an integer number (3283425).

Almost surely, 2^21889470 is an apocalyptic number.

21889470 is an abundant number, since it is smaller than the sum of its proper divisors (30645330).

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

21889470 is a wasteful number, since it uses less digits than its factorization.

21889470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729659.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 21889470 is about 4678.6183858058. The cubic root of 21889470 is about 279.7338883244.

The spelling of 21889470 in words is "twenty-one million, eight hundred eighty-nine thousand, four hundred seventy".