2521121606604 has 36 divisors (see below), whose sum is σ = 6387220845096. Its totient is φ = 838476857088.

The previous prime is 2521121606593. The next prime is 2521121606623. The reversal of 2521121606604 is 4066061211252.

2521121606604 is a `hidden beast` number, since 2 + 5 + 21 + 1 + 21 + 6 + 0 + 6 + 604 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 79025989 + ... + 79057884.

Almost surely, 2^{2521121606604} is an apocalyptic number.

It is an amenable number.

2521121606604 is an abundant number, since it is smaller than the sum of its proper divisors (3866099238492).

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

2521121606604 is a wasteful number, since it uses less digits than its factorization.

2521121606604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158084326 (or 158084321 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

Adding to 2521121606604 its reverse (4066061211252), we get a palindrome (6587182817856).

The spelling of 2521121606604 in words is "two trillion, five hundred twenty-one billion, one hundred twenty-one million, six hundred six thousand, six hundred four".