63421138860121 has 9 divisors (see below), whose sum is σ = 73775675358399. Its totient is φ = 54360928383384.

The previous prime is 63421138860089. The next prime is 63421138860137. The reversal of 63421138860121 is 12106883112436.

The square root of 63421138860121 is 7963739.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 11229703655625 + 52191435204496 = 3351075^2 + 7224364^2 .

It is not a de Polignac number, because 63421138860121 - 2⁵ = 63421138860089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (63421138800121) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 55177335 + ... + 56315011.

Almost surely, 2^{63421138860121} is an apocalyptic number.

63421138860121 is the 7963739-th square number.

63421138860121 is the 3981870-th centered octagonal number.

It is an amenable number.

63421138860121 is a deficient number, since it is larger than the sum of its proper divisors (10354536498278).

63421138860121 is an frugal number, since it uses more digits than its factorization.

63421138860121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2275368 (or 1137684 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 46.

The spelling of 63421138860121 in words is "sixty-three trillion, four hundred twenty-one billion, one hundred thirty-eight million, eight hundred sixty thousand, one hundred twenty-one".