121371640 has 32 divisors (see below), whose sum is σ = 294094080. Its totient is φ = 44813952.

The previous prime is 121371629. The next prime is 121371659. The reversal of 121371640 is 46173121.

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, 116184 + ... + 117223.

It is an arithmetic number, because the mean of its divisors is an integer number (9190440).

Almost surely, 2^121371640 is an apocalyptic number.

121371640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121371640 is an abundant number, since it is smaller than the sum of its proper divisors (172722440).

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

121371640 is a wasteful number, since it uses less digits than its factorization.

121371640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233431 (or 233427 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 121371640 is about 11016.8797760527. The cubic root of 121371640 is about 495.1146080237.

The spelling of 121371640 in words is "one hundred twenty-one million, three hundred seventy-one thousand, six hundred forty".