21739102 has 48 divisors (see below), whose sum is σ = 42096096. Its totient is φ = 8236800.

The previous prime is 21739049. The next prime is 21739103. The reversal of 21739102 is 20193712.

It is a Smith number, since the sum of its digits (25) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21739103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69298 + ... + 69610.

It is an arithmetic number, because the mean of its divisors is an integer number (877002).

Almost surely, 2^21739102 is an apocalyptic number.

21739102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21739102 is a deficient number, since it is larger than the sum of its proper divisors (20356994).

21739102 is a wasteful number, since it uses less digits than its factorization.

21739102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385 (or 374 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 21739102 is about 4662.5209919098. The cubic root of 21739102 is about 279.0918793157.

The spelling of 21739102 in words is "twenty-one million, seven hundred thirty-nine thousand, one hundred two".