21046885 has 16 divisors (see below), whose sum is σ = 25909632. Its totient is φ = 16408000.

The previous prime is 21046877. The next prime is 21046897. The reversal of 21046885 is 58864012.

It is not a de Polignac number, because 21046885 - 2³ = 21046877 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21046885.

It is a congruent number.

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, 35562 + ... + 36148.

It is an arithmetic number, because the mean of its divisors is an integer number (1619352).

Almost surely, 2^21046885 is an apocalyptic number.

It is an amenable number.

21046885 is a deficient number, since it is larger than the sum of its proper divisors (4862747).

21046885 is a wasteful number, since it uses less digits than its factorization.

21046885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764.

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 21046885 is about 4587.6884157493. The cubic root of 21046885 is about 276.0975859152.

The spelling of 21046885 in words is "twenty-one million, forty-six thousand, eight hundred eighty-five".