21871708 has 6 divisors (see below), whose sum is σ = 38275496. Its totient is φ = 10935852.

The previous prime is 21871667. The next prime is 21871721. The reversal of 21871708 is 80717812.

It is a super-2 number, since 2×21871708² = 956743221674528, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2733960 + ... + 2733967.

Almost surely, 2^21871708 is an apocalyptic number.

It is an amenable number.

21871708 is a deficient number, since it is larger than the sum of its proper divisors (16403788).

21871708 is a wasteful number, since it uses less digits than its factorization.

21871708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5467931 (or 5467929 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 34.

The square root of 21871708 is about 4676.7197906225. The cubic root of 21871708 is about 279.6582053918.

The spelling of 21871708 in words is "twenty-one million, eight hundred seventy-one thousand, seven hundred eight".