21101902 has 16 divisors (see below), whose sum is σ = 33126912. Its totient is φ = 10062360.

The previous prime is 21101887. The next prime is 21101903. The reversal of 21101902 is 20910112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101903) 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, 28663 + ... + 29389.

It is an arithmetic number, because the mean of its divisors is an integer number (2070432).

Almost surely, 2^21101902 is an apocalyptic number.

21101902 is a deficient number, since it is larger than the sum of its proper divisors (12025010).

21101902 is a wasteful number, since it uses less digits than its factorization.

21101902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1383.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 21101902 is about 4593.6806593406. The cubic root of 21101902 is about 276.3379515616.

The spelling of 21101902 in words is "twenty-one million, one hundred one thousand, nine hundred two".