21031050 has 24 divisors (see below), whose sum is σ = 52157376. Its totient is φ = 5608240.

The previous prime is 21031033. The next prime is 21031063. The reversal of 21031050 is 5013012.

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, 69954 + ... + 70253.

It is an arithmetic number, because the mean of its divisors is an integer number (2173224).

Almost surely, 2^21031050 is an apocalyptic number.

21031050 is an abundant number, since it is smaller than the sum of its proper divisors (31126326).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21031050 is a wasteful number, since it uses less digits than its factorization.

21031050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140222 (or 140217 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 12.

The square root of 21031050 is about 4585.9622763385. The cubic root of 21031050 is about 276.0283262253.

Adding to 21031050 its reverse (5013012), we get a palindrome (26044062).

The spelling of 21031050 in words is "twenty-one million, thirty-one thousand, fifty".