21552225451 has 4 divisors (see below), whose sum is σ = 21749952400. Its totient is φ = 21354498504.

The previous prime is 21552225437. The next prime is 21552225491. The reversal of 21552225451 is 15452225512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21552225451 - 2¹³ = 21552217259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21552225491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98863311 + ... + 98863528.

It is an arithmetic number, because the mean of its divisors is an integer number (5437488100).

Almost surely, 2^21552225451 is an apocalyptic number.

21552225451 is a deficient number, since it is larger than the sum of its proper divisors (197726949).

21552225451 is a wasteful number, since it uses less digits than its factorization.

21552225451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197726948.

The product of its digits is 40000, while the sum is 34.

The spelling of 21552225451 in words is "twenty-one billion, five hundred fifty-two million, two hundred twenty-five thousand, four hundred fifty-one".