2521621130861 has 16 divisors (see below), whose sum is σ = 2901262541184. Its totient is φ = 2146879832064.

The previous prime is 2521621130857. The next prime is 2521621130867. The reversal of 2521621130861 is 1680311261252.

It is a cyclic number.

It is not a de Polignac number, because 2521621130861 - 2² = 2521621130857 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2521621130867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1350335 + ... + 2620428.

It is an arithmetic number, because the mean of its divisors is an integer number (181328908824).

Almost surely, 2^{2521621130861} is an apocalyptic number.

It is an amenable number.

2521621130861 is a deficient number, since it is larger than the sum of its proper divisors (379641410323).

2521621130861 is a wasteful number, since it uses less digits than its factorization.

2521621130861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3971380.

The product of its (nonzero) digits is 34560, while the sum is 38.

The spelling of 2521621130861 in words is "two trillion, five hundred twenty-one billion, six hundred twenty-one million, one hundred thirty thousand, eight hundred sixty-one".