21377120 has 96 divisors (see below), whose sum is σ = 54468288. Its totient is φ = 7907328.

The previous prime is 21377119. The next prime is 21377129. The reversal of 21377120 is 2177312.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21377129) 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, 136082 + ... + 136238.

It is an arithmetic number, because the mean of its divisors is an integer number (567378).

Almost surely, 2^21377120 is an apocalyptic number.

21377120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21377120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27234144).

21377120 is an abundant number, since it is smaller than the sum of its proper divisors (33091168).

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

21377120 is a wasteful number, since it uses less digits than its factorization.

21377120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232 (or 224 counting only the distinct ones).

The product of its (nonzero) digits is 588, while the sum is 23.

The square root of 21377120 is about 4623.5397694840. The cubic root of 21377120 is about 277.5341299363.

The spelling of 21377120 in words is "twenty-one million, three hundred seventy-seven thousand, one hundred twenty".