21144102552 has 48 divisors (see below), whose sum is σ = 58204064880. Its totient is φ = 6932491200.

The previous prime is 21144102523. The next prime is 21144102559. The reversal of 21144102552 is 25520144112.

It is a happy number.

21144102552 is a `hidden beast` number, since 2 + 1 + 1 + 4 + 4 + 102 + 552 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21144102559) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2402724 + ... + 2411507.

It is an arithmetic number, because the mean of its divisors is an integer number (1212584685).

Almost surely, 2^21144102552 is an apocalyptic number.

It is an amenable number.

21144102552 is an abundant number, since it is smaller than the sum of its proper divisors (37059962328).

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

21144102552 is a wasteful number, since it uses less digits than its factorization.

21144102552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4814304 (or 4814297 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

Adding to 21144102552 its reverse (25520144112), we get a palindrome (46664246664).

The spelling of 21144102552 in words is "twenty-one billion, one hundred forty-four million, one hundred two thousand, five hundred fifty-two".