21171692 has 6 divisors (see below), whose sum is σ = 37050468. Its totient is φ = 10585844.

The previous prime is 21171673. The next prime is 21171701. The reversal of 21171692 is 29617112.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2646458 + ... + 2646465.

It is an arithmetic number, because the mean of its divisors is an integer number (6175078).

Almost surely, 2^21171692 is an apocalyptic number.

It is an amenable number.

21171692 is a deficient number, since it is larger than the sum of its proper divisors (15878776).

21171692 is a wasteful number, since it uses less digits than its factorization.

21171692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5292927 (or 5292925 counting only the distinct ones).

The product of its digits is 1512, while the sum is 29.

The square root of 21171692 is about 4601.2706940583. The cubic root of 21171692 is about 276.6422591007.

The spelling of 21171692 in words is "twenty-one million, one hundred seventy-one thousand, six hundred ninety-two".