21292180 has 48 divisors (see below), whose sum is σ = 55036800. Its totient is φ = 6738048.

The previous prime is 21292171. The next prime is 21292189. The reversal of 21292180 is 8129212.

It is an interprime number because it is at equal distance from previous prime (21292171) and next prime (21292189).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21292189) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4030 + ... + 7669.

It is an arithmetic number, because the mean of its divisors is an integer number (1146600).

Almost surely, 2^21292180 is an apocalyptic number.

21292180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21292180 is an abundant number, since it is smaller than the sum of its proper divisors (33744620).

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

21292180 is a wasteful number, since it uses less digits than its factorization.

21292180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11728 (or 11726 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 21292180 is about 4614.3450239444. The cubic root of 21292180 is about 277.1660566442.

The spelling of 21292180 in words is "twenty-one million, two hundred ninety-two thousand, one hundred eighty".