6361521621 has 16 divisors (see below), whose sum is σ = 10439420544. Its totient is φ = 3355527744.

The previous prime is 6361521599. The next prime is 6361521623. The reversal of 6361521621 is 1261251636.

It is not a de Polignac number, because 6361521621 - 2⁶ = 6361521557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6361521623) 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, 11650866 + ... + 11651411.

It is an arithmetic number, because the mean of its divisors is an integer number (652463784).

Almost surely, 2^6361521621 is an apocalyptic number.

It is an amenable number.

6361521621 is a deficient number, since it is larger than the sum of its proper divisors (4077898923).

6361521621 is a wasteful number, since it uses less digits than its factorization.

6361521621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23302300.

The product of its digits is 12960, while the sum is 33.

The square root of 6361521621 is about 79759.1475694168. The cubic root of 6361521621 is about 1852.9072012498.

The spelling of 6361521621 in words is "six billion, three hundred sixty-one million, five hundred twenty-one thousand, six hundred twenty-one".