21731038 has 8 divisors (see below), whose sum is σ = 37253232. Its totient is φ = 9313296.

The previous prime is 21731029. The next prime is 21731051. The reversal of 21731038 is 83013712.

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, 776095 + ... + 776122.

It is an arithmetic number, because the mean of its divisors is an integer number (4656654).

Almost surely, 2^21731038 is an apocalyptic number.

21731038 is a deficient number, since it is larger than the sum of its proper divisors (15522194).

21731038 is a wasteful number, since it uses less digits than its factorization.

21731038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1552226.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 21731038 is about 4661.6561434752. The cubic root of 21731038 is about 279.0573658499.

The spelling of 21731038 in words is "twenty-one million, seven hundred thirty-one thousand, thirty-eight".