21831485 has 32 divisors (see below), whose sum is σ = 31207680. Its totient is φ = 14496768.

The previous prime is 21831449. The next prime is 21831493. The reversal of 21831485 is 58413812.

21831485 = 59² + 60² + ... + 403².

It is not a de Polignac number, because 21831485 - 2¹² = 21827389 is a prime.

It is a super-2 number, since 2×21831485² = 953227474610450, which contains 22 as substring.

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, 24986 + ... + 25844.

It is an arithmetic number, because the mean of its divisors is an integer number (975240).

Almost surely, 2^21831485 is an apocalyptic number.

It is an amenable number.

21831485 is a deficient number, since it is larger than the sum of its proper divisors (9376195).

21831485 is a wasteful number, since it uses less digits than its factorization.

21831485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 917.

The product of its digits is 7680, while the sum is 32.

The square root of 21831485 is about 4672.4174685060. The cubic root of 21831485 is about 279.4866657532.

The spelling of 21831485 in words is "twenty-one million, eight hundred thirty-one thousand, four hundred eighty-five".