121213940 has 24 divisors (see below), whose sum is σ = 259967232. Its totient is φ = 47453600.

The previous prime is 121213913. The next prime is 121213951. The reversal of 121213940 is 49312121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63536 + ... + 65415.

It is an arithmetic number, because the mean of its divisors is an integer number (10831968).

Almost surely, 2^121213940 is an apocalyptic number.

121213940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121213940 is an abundant number, since it is smaller than the sum of its proper divisors (138753292).

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

121213940 is a wasteful number, since it uses less digits than its factorization.

121213940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129007 (or 129005 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 121213940 is about 11009.7202507602. The cubic root of 121213940 is about 494.9000784604.

It can be divided in two parts, 12121 and 3940, that added together give a palindrome (16061).

The spelling of 121213940 in words is "one hundred twenty-one million, two hundred thirteen thousand, nine hundred forty".