121200520 has 48 divisors (see below), whose sum is σ = 317228940. Its totient is φ = 41553792.

The previous prime is 121200517. The next prime is 121200539. The reversal of 121200520 is 25002121.

It can be written as a sum of positive squares in 2 ways, for example, as 118330884 + 2869636 = 10878^2 + 1694^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 121200520.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28959 + ... + 32878.

Almost surely, 2^121200520 is an apocalyptic number.

121200520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121200520 is an abundant number, since it is smaller than the sum of its proper divisors (196028420).

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

121200520 is a wasteful number, since it uses less digits than its factorization.

121200520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61862 (or 61851 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 121200520 is about 11009.1107724466. The cubic root of 121200520 is about 494.8818137730.

Adding to 121200520 its reverse (25002121), we get a palindrome (146202641).

The spelling of 121200520 in words is "one hundred twenty-one million, two hundred thousand, five hundred twenty".