21046164 has 24 divisors (see below), whose sum is σ = 49424928. Its totient is φ = 6970080.

The previous prime is 21046147. The next prime is 21046169. The reversal of 21046164 is 46164012.

It is a super-2 number, since 2×21046164² = 885882038229792, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21046169) 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, 3702 + ... + 7469.

It is an arithmetic number, because the mean of its divisors is an integer number (2059372).

Almost surely, 2^21046164 is an apocalyptic number.

It is an amenable number.

21046164 is an abundant number, since it is smaller than the sum of its proper divisors (28378764).

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

21046164 is a wasteful number, since it uses less digits than its factorization.

21046164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11335 (or 11333 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 21046164 is about 4587.6098351974. The cubic root of 21046164 is about 276.0944331345.

The spelling of 21046164 in words is "twenty-one million, forty-six thousand, one hundred sixty-four".