121631636450 has 24 divisors (see below), whose sum is σ = 227115159012. Its totient is φ = 48463339520.

The previous prime is 121631636447. The next prime is 121631636479. The reversal of 121631636450 is 54636136121.

It can be written as a sum of positive squares in 6 ways, for example, as 115622441089 + 6009195361 = 340033^2 + 77519^2 .

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, 4719899 + ... + 4745598.

Almost surely, 2^121631636450 is an apocalyptic number.

121631636450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121631636450 is a deficient number, since it is larger than the sum of its proper divisors (105483522562).

121631636450 is a wasteful number, since it uses less digits than its factorization.

121631636450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9465766 (or 9465761 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 38.

The spelling of 121631636450 in words is "one hundred twenty-one billion, six hundred thirty-one million, six hundred thirty-six thousand, four hundred fifty".