63121212136 has 8 divisors (see below), whose sum is σ = 118352272770. Its totient is φ = 31560606064.

The previous prime is 63121212107. The next prime is 63121212137.

63121212136 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 62903649636 + 217562500 = 250806^2 + 14750^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (63121212137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3945075751 + ... + 3945075766.

Almost surely, 2^63121212136 is an apocalyptic number.

It is an amenable number.

63121212136 is a deficient number, since it is larger than the sum of its proper divisors (55231060634).

63121212136 is a wasteful number, since it uses less digits than its factorization.

63121212136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7890151523 (or 7890151519 counting only the distinct ones).

The product of its digits is 2592, while the sum is 28.

The spelling of 63121212136 in words is "sixty-three billion, one hundred twenty-one million, two hundred twelve thousand, one hundred thirty-six".