121407009940 has 48 divisors (see below), whose sum is σ = 270886366800. Its totient is φ = 45706131456.

The previous prime is 121407009931. The next prime is 121407009947. The reversal of 121407009940 is 49900704121.

It can be written as a sum of positive squares in 8 ways, for example, as 2145912976 + 119261096964 = 46324^2 + 345342^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 121407009940.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121407009947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 519525 + ... + 716044.

It is an arithmetic number, because the mean of its divisors is an integer number (5643465975).

Almost surely, 2^121407009940 is an apocalyptic number.

121407009940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121407009940 is an abundant number, since it is smaller than the sum of its proper divisors (149479356860).

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

121407009940 is a wasteful number, since it uses less digits than its factorization.

121407009940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1235629 (or 1235593 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 37.

The spelling of 121407009940 in words is "one hundred twenty-one billion, four hundred seven million, nine thousand, nine hundred forty".