121252200520 has 128 divisors (see below), whose sum is σ = 299106743040. Its totient is φ = 43871984640.

The previous prime is 121252200479. The next prime is 121252200521. The reversal of 121252200520 is 25002252121.

It is a super-2 number, since 2×121252200520² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 121252200491 and 121252200500.

It is not an unprimeable number, because it can be changed into a prime (121252200521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 114065509 + ... + 114066571.

It is an arithmetic number, because the mean of its divisors is an integer number (2336771430).

Almost surely, 2^121252200520 is an apocalyptic number.

121252200520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121252200520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149553371520).

121252200520 is an abundant number, since it is smaller than the sum of its proper divisors (177854542520).

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

121252200520 is a wasteful number, since it uses less digits than its factorization.

121252200520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2135 (or 2131 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

Adding to 121252200520 its reverse (25002252121), we get a palindrome (146254452641).

The spelling of 121252200520 in words is "one hundred twenty-one billion, two hundred fifty-two million, two hundred thousand, five hundred twenty".