21870485 has 32 divisors (see below), whose sum is σ = 32804352. Its totient is φ = 13628160.

The previous prime is 21870473. The next prime is 21870547. The reversal of 21870485 is 58407812.

It is not a de Polignac number, because 21870485 - 2⁶ = 21870421 is a prime.

It is a super-2 number, since 2×21870485² = 956636228270450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

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 31 ways as a sum of consecutive naturals, for example, 31967 + ... + 32643.

It is an arithmetic number, because the mean of its divisors is an integer number (1025136).

Almost surely, 2^21870485 is an apocalyptic number.

It is an amenable number.

21870485 is a deficient number, since it is larger than the sum of its proper divisors (10933867).

21870485 is a wasteful number, since it uses less digits than its factorization.

21870485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 773.

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 21870485 is about 4676.5890347560. The cubic root of 21870485 is about 279.6529927466.

The spelling of 21870485 in words is "twenty-one million, eight hundred seventy thousand, four hundred eighty-five".