21046172 has 24 divisors (see below), whose sum is σ = 42198240. Its totient is φ = 8997120.

The previous prime is 21046171. The next prime is 21046217. The reversal of 21046172 is 27164012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21046171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15272 + ... + 16592.

It is an arithmetic number, because the mean of its divisors is an integer number (1758260).

Almost surely, 2^21046172 is an apocalyptic number.

It is an amenable number.

21046172 is an abundant number, since it is smaller than the sum of its proper divisors (21152068).

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

21046172 is a wasteful number, since it uses less digits than its factorization.

21046172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1901 (or 1899 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 21046172 is about 4587.6107071111. The cubic root of 21046172 is about 276.0944681172.

The spelling of 21046172 in words is "twenty-one million, forty-six thousand, one hundred seventy-two".