21902485 has 8 divisors (see below), whose sum is σ = 28672416. Its totient is φ = 15929040.

The previous prime is 21902479. The next prime is 21902519. The reversal of 21902485 is 58420912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21902485 - 2¹³ = 21894293 is a prime.

It is a Duffinian 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, 199059 + ... + 199168.

It is an arithmetic number, because the mean of its divisors is an integer number (3584052).

Almost surely, 2^21902485 is an apocalyptic number.

It is an amenable number.

21902485 is a deficient number, since it is larger than the sum of its proper divisors (6769931).

21902485 is a wasteful number, since it uses less digits than its factorization.

21902485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398243.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 21902485 is about 4680.0090811878. The cubic root of 21902485 is about 279.7893185568.

The spelling of 21902485 in words is "twenty-one million, nine hundred two thousand, four hundred eighty-five".