121638210432 has 32 divisors (see below), whose sum is σ = 323101497480. Its totient is φ = 40546070016.

The previous prime is 121638210427. The next prime is 121638210451. The reversal of 121638210432 is 234012836121.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 121638210393 and 121638210402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158382703 + ... + 158383470.

Almost surely, 2^121638210432 is an apocalyptic number.

121638210432 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121638210432 is an abundant number, since it is smaller than the sum of its proper divisors (201463287048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121638210432 is an equidigital number, since it uses as much as digits as its factorization.

121638210432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316766190 (or 316766178 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The spelling of 121638210432 in words is "one hundred twenty-one billion, six hundred thirty-eight million, two hundred ten thousand, four hundred thirty-two".