121222115440 has 20 divisors (see below), whose sum is σ = 281841418584. Its totient is φ = 48488846144.

The previous prime is 121222115429. The next prime is 121222115447. The reversal of 121222115440 is 44511222121.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121222115447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 757638142 + ... + 757638301.

Almost surely, 2^121222115440 is an apocalyptic number.

121222115440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121222115440 is an abundant number, since it is smaller than the sum of its proper divisors (160619303144).

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

121222115440 is a wasteful number, since it uses less digits than its factorization.

121222115440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1515276456 (or 1515276450 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

Adding to 121222115440 its reverse (44511222121), we get a palindrome (165733337561).

The spelling of 121222115440 in words is "one hundred twenty-one billion, two hundred twenty-two million, one hundred fifteen thousand, four hundred forty".