121440531421 has 8 divisors (see below), whose sum is σ = 135711813888. Its totient is φ = 107707788000.

The previous prime is 121440531419. The next prime is 121440531427. The reversal of 121440531421 is 124135044121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121440531421 - 2¹ = 121440531419 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121440531421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121440531427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134634285 + ... + 134635186.

It is an arithmetic number, because the mean of its divisors is an integer number (16963976736).

Almost surely, 2^121440531421 is an apocalyptic number.

121440531421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121440531421 is a deficient number, since it is larger than the sum of its proper divisors (14271282467).

121440531421 is a wasteful number, since it uses less digits than its factorization.

121440531421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269269523.

The product of its (nonzero) digits is 3840, while the sum is 28.

Adding to 121440531421 its reverse (124135044121), we get a palindrome (245575575542).

The spelling of 121440531421 in words is "one hundred twenty-one billion, four hundred forty million, five hundred thirty-one thousand, four hundred twenty-one".