121371720 has 32 divisors (see below), whose sum is σ = 364115520. Its totient is φ = 32365760.

The previous prime is 121371709. The next prime is 121371737. The reversal of 121371720 is 27173121.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 505596 + ... + 505835.

It is an arithmetic number, because the mean of its divisors is an integer number (11378610).

Almost surely, 2^121371720 is an apocalyptic number.

121371720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121371720 is an abundant number, since it is smaller than the sum of its proper divisors (242743800).

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

121371720 is a wasteful number, since it uses less digits than its factorization.

121371720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1011445 (or 1011441 counting only the distinct ones).

The product of its (nonzero) digits is 588, while the sum is 24.

The square root of 121371720 is about 11016.8834068442. The cubic root of 121371720 is about 495.1147168057.

The spelling of 121371720 in words is "one hundred twenty-one million, three hundred seventy-one thousand, seven hundred twenty".