21111902 has 8 divisors (see below), whose sum is σ = 36191856. Its totient is φ = 9047952.

The previous prime is 21111877. The next prime is 21111931. The reversal of 21111902 is 20911112.

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

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, 753983 + ... + 754010.

It is an arithmetic number, because the mean of its divisors is an integer number (4523982).

Almost surely, 2^21111902 is an apocalyptic number.

21111902 is a deficient number, since it is larger than the sum of its proper divisors (15079954).

21111902 is a wasteful number, since it uses less digits than its factorization.

21111902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1508002.

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 21111902 is about 4594.7689822232. The cubic root of 21111902 is about 276.3815960179.

The spelling of 21111902 in words is "twenty-one million, one hundred eleven thousand, nine hundred two".