121154420736 has 240 divisors, whose sum is σ = 362586515200. Its totient is φ = 39977680896.

The previous prime is 121154420731. The next prime is 121154420743. The reversal of 121154420736 is 637024451121.

121154420736 is a `hidden beast` number, since 1 + 21 + 1 + 544 + 20 + 73 + 6 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 121154420736.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121154420731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45562575 + ... + 45565233.

Almost surely, 2^121154420736 is an apocalyptic number.

121154420736 is a gapful number since it is divisible by the number (16) 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 121154420736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (181293257600).

121154420736 is an abundant number, since it is smaller than the sum of its proper divisors (241432094464).

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

121154420736 is an equidigital number, since it uses as much as digits as its factorization.

121154420736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2799 (or 2767 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

Adding to 121154420736 its reverse (637024451121), we get a palindrome (758178871857).

The spelling of 121154420736 in words is "one hundred twenty-one billion, one hundred fifty-four million, four hundred twenty thousand, seven hundred thirty-six".