121451758020 has 240 divisors, whose sum is σ = 403797018240. Its totient is φ = 30452806656.

The previous prime is 121451758009. The next prime is 121451758031. The reversal of 121451758020 is 20857154121.

It is a happy number.

121451758020 is a `hidden beast` number, since 1 + 2 + 1 + 4 + 51 + 7 + 580 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (121451758009) and next prime (121451758031).

It is a super-2 number, since 2×121451758020² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 51746487 + ... + 51748833.

It is an arithmetic number, because the mean of its divisors is an integer number (1682487576).

Almost surely, 2^121451758020 is an apocalyptic number.

121451758020 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 121451758020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (201898509120).

121451758020 is an abundant number, since it is smaller than the sum of its proper divisors (282345260220).

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

121451758020 is a wasteful number, since it uses less digits than its factorization.

121451758020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4264 (or 4253 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The spelling of 121451758020 in words is "one hundred twenty-one billion, four hundred fifty-one million, seven hundred fifty-eight thousand, twenty".