21552045 has 8 divisors (see below), whose sum is σ = 34483296. Its totient is φ = 11494416.

The previous prime is 21552043. The next prime is 21552053. The reversal of 21552045 is 54025512.

It is a happy number.

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

It is not a de Polignac number, because 21552045 - 2¹ = 21552043 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21552043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 718387 + ... + 718416.

It is an arithmetic number, because the mean of its divisors is an integer number (4310412).

Almost surely, 2^21552045 is an apocalyptic number.

It is an amenable number.

21552045 is a deficient number, since it is larger than the sum of its proper divisors (12931251).

21552045 is a wasteful number, since it uses less digits than its factorization.

21552045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1436811.

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 21552045 is about 4642.4180122001. The cubic root of 21552045 is about 278.2890778677.

Adding to 21552045 its reverse (54025512), we get a palindrome (75577557).

The spelling of 21552045 in words is "twenty-one million, five hundred fifty-two thousand, forty-five".