121138100490 has 64 divisors (see below), whose sum is σ = 317540321280. Its totient is φ = 29331743040.

The previous prime is 121138100467. The next prime is 121138100507. The reversal of 121138100490 is 94001831121.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58107 + ... + 495633.

It is an arithmetic number, because the mean of its divisors is an integer number (4961567520).

Almost surely, 2^121138100490 is an apocalyptic number.

121138100490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121138100490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (158770160640).

121138100490 is an abundant number, since it is smaller than the sum of its proper divisors (196402220790).

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

121138100490 is a wasteful number, since it uses less digits than its factorization.

121138100490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438387.

The product of its (nonzero) digits is 1728, while the sum is 30.

The spelling of 121138100490 in words is "one hundred twenty-one billion, one hundred thirty-eight million, one hundred thousand, four hundred ninety".