21155164246652 has 24 divisors (see below), whose sum is σ = 38458649692512. Its totient is φ = 10174245939200.

The previous prime is 21155164246651. The next prime is 21155164246661. The reversal of 21155164246652 is 25664246155112.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21155164246652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21155164246651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 908403173 + ... + 908426460.

It is an arithmetic number, because the mean of its divisors is an integer number (1602443737188).

Almost surely, 2^{21155164246652} is an apocalyptic number.

It is an amenable number.

21155164246652 is a deficient number, since it is larger than the sum of its proper divisors (17303485445860).

21155164246652 is a wasteful number, since it uses less digits than its factorization.

21155164246652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1816829749 (or 1816829747 counting only the distinct ones).

The product of its digits is 3456000, while the sum is 50.

The spelling of 21155164246652 in words is "twenty-one trillion, one hundred fifty-five billion, one hundred sixty-four million, two hundred forty-six thousand, six hundred fifty-two".