121231451040 has 384 divisors, whose sum is σ = 440719792128. Its totient is φ = 27439534080.

The previous prime is 121231451009. The next prime is 121231451041. The reversal of 121231451040 is 40154132121.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 121231451040.

It is not an unprimeable number, because it can be changed into a prime (121231451041) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 217650442 + ... + 217650998.

It is an arithmetic number, because the mean of its divisors is an integer number (1147707792).

Almost surely, 2^121231451040 is an apocalyptic number.

121231451040 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 121231451040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (220359896064).

121231451040 is an abundant number, since it is smaller than the sum of its proper divisors (319488341088).

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

121231451040 is a wasteful number, since it uses less digits than its factorization.

121231451040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1100 (or 1092 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 121231451040 its reverse (40154132121), we get a palindrome (161385583161).

The spelling of 121231451040 in words is "one hundred twenty-one billion, two hundred thirty-one million, four hundred fifty-one thousand, forty".