21050902 has 8 divisors (see below), whose sum is σ = 31650912. Its totient is φ = 10500600.

The previous prime is 21050873. The next prime is 21050921. The reversal of 21050902 is 20905012.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21050902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11349 + ... + 13072.

It is an arithmetic number, because the mean of its divisors is an integer number (3956364).

Almost surely, 2^21050902 is an apocalyptic number.

21050902 is a deficient number, since it is larger than the sum of its proper divisors (10600010).

21050902 is a wasteful number, since it uses less digits than its factorization.

21050902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24854.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 21050902 is about 4588.1261970438. The cubic root of 21050902 is about 276.1151500891.

Adding to 21050902 its reverse (20905012), we get a palindrome (41955914).

It can be divided in two parts, 21050 and 902, that added together give a cube (21952 = 28³).

The spelling of 21050902 in words is "twenty-one million, fifty thousand, nine hundred two".