21739068 has 36 divisors (see below), whose sum is σ = 59179848. Its totient is φ = 6688800.

The previous prime is 21739049. The next prime is 21739103. The reversal of 21739068 is 86093712.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22758 + ... + 23693.

Almost surely, 2^21739068 is an apocalyptic number.

It is an amenable number.

21739068 is an abundant number, since it is smaller than the sum of its proper divisors (37440780).

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

21739068 is a wasteful number, since it uses less digits than its factorization.

21739068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46474 (or 46469 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 21739068 is about 4662.5173458122. The cubic root of 21739068 is about 279.0917338155.

The spelling of 21739068 in words is "twenty-one million, seven hundred thirty-nine thousand, sixty-eight".