21377248 has 36 divisors (see below), whose sum is σ = 43123752. Its totient is φ = 10429440.

The previous prime is 21377233. The next prime is 21377249. The reversal of 21377248 is 84277312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21377249) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 220336 + ... + 220432.

It is an arithmetic number, because the mean of its divisors is an integer number (1197882).

Almost surely, 2^21377248 is an apocalyptic number.

It is an amenable number.

21377248 is an abundant number, since it is smaller than the sum of its proper divisors (21746504).

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

21377248 is an frugal number, since it uses more digits than its factorization.

21377248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275 (or 170 counting only the distinct ones).

The product of its digits is 18816, while the sum is 34.

The square root of 21377248 is about 4623.5536116714. The cubic root of 21377248 is about 277.5346838665.

The spelling of 21377248 in words is "twenty-one million, three hundred seventy-seven thousand, two hundred forty-eight".