21106902 has 16 divisors (see below), whose sum is σ = 42324912. Its totient is φ = 7017120.

The previous prime is 21106873. The next prime is 21106907. The reversal of 21106902 is 20960112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21106907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2049 + ... + 6812.

It is an arithmetic number, because the mean of its divisors is an integer number (2645307).

Almost surely, 2^21106902 is an apocalyptic number.

21106902 is an abundant number, since it is smaller than the sum of its proper divisors (21218010).

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

21106902 is a wasteful number, since it uses less digits than its factorization.

21106902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9263.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 21106902 is about 4594.2248530084. The cubic root of 21106902 is about 276.3597755129.

The spelling of 21106902 in words is "twenty-one million, one hundred six thousand, nine hundred two".