21552622749 has 16 divisors (see below), whose sum is σ = 36491213440. Its totient is φ = 12315784320.

The previous prime is 21552622747. The next prime is 21552622753. The reversal of 21552622749 is 94722625512.

21552622749 is a `hidden beast` number, since 2 + 1 + 552 + 6 + 22 + 74 + 9 = 666.

It is not a de Polignac number, because 21552622749 - 2¹ = 21552622747 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 (21552622747) 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, 57017332 + ... + 57017709.

It is an arithmetic number, because the mean of its divisors is an integer number (2280700840).

Almost surely, 2^21552622749 is an apocalyptic number.

It is an amenable number.

21552622749 is a deficient number, since it is larger than the sum of its proper divisors (14938590691).

21552622749 is a wasteful number, since it uses less digits than its factorization.

21552622749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114035057 (or 114035051 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The spelling of 21552622749 in words is "twenty-one billion, five hundred fifty-two million, six hundred twenty-two thousand, seven hundred forty-nine".