121537820 has 12 divisors (see below), whose sum is σ = 255229464. Its totient is φ = 48615120.

The previous prime is 121537807. The next prime is 121537849. The reversal of 121537820 is 28735121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3038426 + ... + 3038465.

It is an arithmetic number, because the mean of its divisors is an integer number (21269122).

Almost surely, 2^121537820 is an apocalyptic number.

121537820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121537820 is an abundant number, since it is smaller than the sum of its proper divisors (133691644).

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

121537820 is a wasteful number, since it uses less digits than its factorization.

121537820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6076900 (or 6076898 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 121537820 is about 11024.4192590812. The cubic root of 121537820 is about 495.3404724920.

The spelling of 121537820 in words is "one hundred twenty-one million, five hundred thirty-seven thousand, eight hundred twenty".