121453431240 has 32 divisors (see below), whose sum is σ = 364360294080. Its totient is φ = 32387581632.

The previous prime is 121453431233. The next prime is 121453431293. The reversal of 121453431240 is 42134354121.

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

It is a junction number, because it is equal to n+sod(n) for n = 121453431198 and 121453431207.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 506055844 + ... + 506056083.

It is an arithmetic number, because the mean of its divisors is an integer number (11386259190).

Almost surely, 2^121453431240 is an apocalyptic number.

121453431240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121453431240 is an abundant number, since it is smaller than the sum of its proper divisors (242906862840).

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

121453431240 is a wasteful number, since it uses less digits than its factorization.

121453431240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1012111941 (or 1012111937 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

Adding to 121453431240 its reverse (42134354121), we get a palindrome (163587785361).

The spelling of 121453431240 in words is "one hundred twenty-one billion, four hundred fifty-three million, four hundred thirty-one thousand, two hundred forty".