121561930 has 16 divisors (see below), whose sum is σ = 250070400. Its totient is φ = 41678352.

The previous prime is 121561927. The next prime is 121561933. The reversal of 121561930 is 39165121.

It is an interprime number because it is at equal distance from previous prime (121561927) and next prime (121561933).

It is not an unprimeable number, because it can be changed into a prime (121561933) 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, 868230 + ... + 868369.

It is an arithmetic number, because the mean of its divisors is an integer number (15629400).

Almost surely, 2^121561930 is an apocalyptic number.

121561930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121561930 is an abundant number, since it is smaller than the sum of its proper divisors (128508470).

121561930 is a wasteful number, since it uses less digits than its factorization.

121561930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1736613.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 121561930 is about 11025.5126864922. The cubic root of 121561930 is about 495.3732246268.

The spelling of 121561930 in words is "one hundred twenty-one million, five hundred sixty-one thousand, nine hundred thirty".