121400213440 has 56 divisors (see below), whose sum is σ = 315364654512. Its totient is φ = 44145530880.

The previous prime is 121400213437. The next prime is 121400213449. The reversal of 121400213440 is 44312004121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121400213449) 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, 17240829 + ... + 17247868.

Almost surely, 2^121400213440 is an apocalyptic number.

121400213440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121400213440 is an abundant number, since it is smaller than the sum of its proper divisors (193964441072).

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

121400213440 is a wasteful number, since it uses less digits than its factorization.

121400213440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34488725 (or 34488715 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 121400213440 its reverse (44312004121), we get a palindrome (165712217561).

The spelling of 121400213440 in words is "one hundred twenty-one billion, four hundred million, two hundred thirteen thousand, four hundred forty".