21377292 has 48 divisors (see below), whose sum is σ = 52738560. Its totient is φ = 6728512.

The previous prime is 21377269. The next prime is 21377303. The reversal of 21377292 is 29277312.

It is a super-2 number, since 2×21377292² = 913977226506528, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15703 + ... + 17009.

It is an arithmetic number, because the mean of its divisors is an integer number (1098720).

Almost surely, 2^21377292 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21377292, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26369280).

21377292 is an abundant number, since it is smaller than the sum of its proper divisors (31361268).

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

21377292 is a wasteful number, since it uses less digits than its factorization.

21377292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1390 (or 1388 counting only the distinct ones).

The product of its digits is 10584, while the sum is 33.

The square root of 21377292 is about 4623.5583699138. The cubic root of 21377292 is about 277.5348742795.

The spelling of 21377292 in words is "twenty-one million, three hundred seventy-seven thousand, two hundred ninety-two".