21889025 has 12 divisors (see below), whose sum is σ = 27342000. Its totient is φ = 17382480.

The previous prime is 21889019. The next prime is 21889061. The reversal of 21889025 is 52098812.

It is not a de Polignac number, because 21889025 - 2⁶ = 21888961 is a prime.

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, 326 + ... + 6624.

It is an arithmetic number, because the mean of its divisors is an integer number (2278500).

It is a Proth number, since it is equal to 167 ⋅ 2¹⁷ + 1 and 167 < 2¹⁷.

Almost surely, 2^21889025 is an apocalyptic number.

21889025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21889025 is a deficient number, since it is larger than the sum of its proper divisors (5452975).

21889025 is a wasteful number, since it uses less digits than its factorization.

21889025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6448 (or 6443 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 21889025 is about 4678.5708287895. The cubic root of 21889025 is about 279.7319927033.

The spelling of 21889025 in words is "twenty-one million, eight hundred eighty-nine thousand, twenty-five".