21360372 has 72 divisors (see below), whose sum is σ = 56128128. Its totient is φ = 6314880.

The previous prime is 21360371. The next prime is 21360373. The reversal of 21360372 is 27306312.

It is an interprime number because it is at equal distance from previous prime (21360371) and next prime (21360373).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21360371) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 68088 + ... + 68400.

Almost surely, 2^21360372 is an apocalyptic number.

21360372 is a gapful number since it is divisible by the number (22) 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 21360372, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28064064).

21360372 is an abundant number, since it is smaller than the sum of its proper divisors (34767756).

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

21360372 is a wasteful number, since it uses less digits than its factorization.

21360372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389 (or 376 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 24.

The square root of 21360372 is about 4621.7282481773. The cubic root of 21360372 is about 277.4616325496.

Adding to 21360372 its reverse (27306312), we get a palindrome (48666684).

The spelling of 21360372 in words is "twenty-one million, three hundred sixty thousand, three hundred seventy-two".