121421040012 has 24 divisors (see below), whose sum is σ = 314795289200. Its totient is φ = 40473679968.

The previous prime is 121421039983. The next prime is 121421040053. The reversal of 121421040012 is 210040124121.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 562134337 + ... + 562134552.

Almost surely, 2^121421040012 is an apocalyptic number.

121421040012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121421040012 is an abundant number, since it is smaller than the sum of its proper divisors (193374249188).

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

121421040012 is a wasteful number, since it uses less digits than its factorization.

121421040012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1124268902 (or 1124268894 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 121421040012 its reverse (210040124121), we get a palindrome (331461164133).

The spelling of 121421040012 in words is "one hundred twenty-one billion, four hundred twenty-one million, forty thousand, twelve".