21155152651330 has 48 divisors (see below), whose sum is σ = 40557952645560. Its totient is φ = 7941425533184.

The previous prime is 21155152651291. The next prime is 21155152651337. The reversal of 21155152651330 is 3315625155112.

It can be written as a sum of positive squares in 4 ways, for example, as 15577048687729 + 5578103963601 = 3946777^2 + 2361801^2 .

It is not an unprimeable number, because it can be changed into a prime (21155152651337) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37446835 + ... + 38007574.

Almost surely, 2^{21155152651330} is an apocalyptic number.

21155152651330 is a deficient number, since it is larger than the sum of its proper divisors (19402799994230).

21155152651330 is a wasteful number, since it uses less digits than its factorization.

21155152651330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75454515 (or 75454492 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 40.

The spelling of 21155152651330 in words is "twenty-one trillion, one hundred fifty-five billion, one hundred fifty-two million, six hundred fifty-one thousand, three hundred thirty".