21552037 has 8 divisors (see below), whose sum is σ = 23959040. Its totient is φ = 19252080.

The previous prime is 21552031. The next prime is 21552043. The reversal of 21552037 is 73025512.

It is an interprime number because it is at equal distance from previous prime (21552031) and next prime (21552043).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21552037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21552031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26337 + ... + 27142.

It is an arithmetic number, because the mean of its divisors is an integer number (2994880).

Almost surely, 2^21552037 is an apocalyptic number.

It is an amenable number.

21552037 is a deficient number, since it is larger than the sum of its proper divisors (2407003).

21552037 is a wasteful number, since it uses less digits than its factorization.

21552037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53523.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 21552037 is about 4642.4171505801. The cubic root of 21552037 is about 278.2890434346.

Adding to 21552037 its reverse (73025512), we get a palindrome (94577549).

The spelling of 21552037 in words is "twenty-one million, five hundred fifty-two thousand, thirty-seven".