21905102 has 16 divisors (see below), whose sum is σ = 33696000. Its totient is φ = 10675128.

The previous prime is 21905099. The next prime is 21905123. The reversal of 21905102 is 20150912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43649 + ... + 44147.

It is an arithmetic number, because the mean of its divisors is an integer number (2106000).

Almost surely, 2^21905102 is an apocalyptic number.

21905102 is a deficient number, since it is larger than the sum of its proper divisors (11790898).

21905102 is a wasteful number, since it uses less digits than its factorization.

21905102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1015.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 21905102 is about 4680.2886663111. The cubic root of 21905102 is about 279.8004615768.

The spelling of 21905102 in words is "twenty-one million, nine hundred five thousand, one hundred two".