121949251580 has 96 divisors (see below), whose sum is σ = 277462523520. Its totient is φ = 44755706880.

The previous prime is 121949251577. The next prime is 121949251609. The reversal of 121949251580 is 85152949121.

It is a congruent number.

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, 31452602 + ... + 31456478.

It is an arithmetic number, because the mean of its divisors is an integer number (2890234620).

Almost surely, 2^121949251580 is an apocalyptic number.

121949251580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121949251580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138731261760).

121949251580 is an abundant number, since it is smaller than the sum of its proper divisors (155513271940).

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

121949251580 is a wasteful number, since it uses less digits than its factorization.

121949251580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4599 (or 4597 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 47.

The spelling of 121949251580 in words is "one hundred twenty-one billion, nine hundred forty-nine million, two hundred fifty-one thousand, five hundred eighty".