21122652204 has 120 divisors (see below), whose sum is σ = 57919350720. Its totient is φ = 6704653824.

The previous prime is 21122652119. The next prime is 21122652217. The reversal of 21122652204 is 40225622112.

21122652204 is a `hidden beast` number, since 2 + 1 + 1 + 2 + 2 + 652 + 2 + 0 + 4 = 666.

It is a super-2 number, since 2×21122652204² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 544692 + ... + 582180.

It is an arithmetic number, because the mean of its divisors is an integer number (482661256).

Almost surely, 2^21122652204 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21122652204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28959675360).

21122652204 is an abundant number, since it is smaller than the sum of its proper divisors (36796698516).

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

21122652204 is a wasteful number, since it uses less digits than its factorization.

21122652204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37589 (or 37578 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The spelling of 21122652204 in words is "twenty-one billion, one hundred twenty-two million, six hundred fifty-two thousand, two hundred four".