121635745398 has 24 divisors (see below), whose sum is σ = 263571119136. Its totient is φ = 40541094000.

The previous prime is 121635745391. The next prime is 121635745453. The reversal of 121635745398 is 893547536121.

It is a happy number.

121635745398 is a `hidden beast` number, since 1 + 2 + 1 + 6 + 35 + 74 + 539 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121635745391) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 163038 + ... + 519473.

It is an arithmetic number, because the mean of its divisors is an integer number (10982129964).

Almost surely, 2^121635745398 is an apocalyptic number.

121635745398 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

121635745398 is an abundant number, since it is smaller than the sum of its proper divisors (141935373738).

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

121635745398 is a wasteful number, since it uses less digits than its factorization.

121635745398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692420 (or 692417 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 54.

The spelling of 121635745398 in words is "one hundred twenty-one billion, six hundred thirty-five million, seven hundred forty-five thousand, three hundred ninety-eight".