21153525341504 has 28 divisors (see below), whose sum is σ = 42076233617748. Its totient is φ = 10551639705600.

The previous prime is 21153525341491. The next prime is 21153525341537. The reversal of 21153525341504 is 40514352535112.

It can be written as a sum of positive squares in 2 ways, for example, as 7117412951104 + 14036112390400 = 2667848^2 + 3746480^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 392519177 + ... + 392573064.

Almost surely, 2^{21153525341504} is an apocalyptic number.

It is an amenable number.

21153525341504 is a deficient number, since it is larger than the sum of its proper divisors (20922708276244).

21153525341504 is an equidigital number, since it uses as much as digits as its factorization.

21153525341504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785092674 (or 785092664 counting only the distinct ones).

The product of its (nonzero) digits is 360000, while the sum is 41.

Adding to 21153525341504 its reverse (40514352535112), we get a palindrome (61667877876616).

The spelling of 21153525341504 in words is "twenty-one trillion, one hundred fifty-three billion, five hundred twenty-five million, three hundred forty-one thousand, five hundred four".