21346440552 has 48 divisors (see below), whose sum is σ = 57834110880. Its totient is φ = 7112916000.

The previous prime is 21346440551. The next prime is 21346440569. The reversal of 21346440552 is 25504464312.

21346440552 is a `hidden beast` number, since 2 + 1 + 3 + 4 + 64 + 40 + 552 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21346440551) 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 11 ways as a sum of consecutive naturals, for example, 153277 + ... + 257267.

It is an arithmetic number, because the mean of its divisors is an integer number (1204877310).

Almost surely, 2^21346440552 is an apocalyptic number.

It is an amenable number.

21346440552 is an abundant number, since it is smaller than the sum of its proper divisors (36487670328).

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

21346440552 is a wasteful number, since it uses less digits than its factorization.

21346440552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106854 (or 106847 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

It can be divided in two parts, 213464 and 40552, that added together give a square (254016 = 504²).

The spelling of 21346440552 in words is "twenty-one billion, three hundred forty-six million, four hundred forty thousand, five hundred fifty-two".