125221424122520 has 128 divisors (see below), whose sum is σ = 308235256519680. Its totient is φ = 45405754368000.

The previous prime is 125221424122489. The next prime is 125221424122579. The reversal of 125221424122520 is 25221424122521.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 366023864 + ... + 366365816.

It is an arithmetic number, because the mean of its divisors is an integer number (2408087941560).

Almost surely, 2^{125221424122520} is an apocalyptic number.

125221424122520 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 125221424122520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (154117628259840).

125221424122520 is an abundant number, since it is smaller than the sum of its proper divisors (183013832397160).

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

125221424122520 is a wasteful number, since it uses less digits than its factorization.

125221424122520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344337 (or 344333 counting only the distinct ones).

The product of its (nonzero) digits is 51200, while the sum is 35.

Subtracting from 125221424122520 its reverse (25221424122521), we obtain a palindrome (99999999999999).

The spelling of 125221424122520 in words is "one hundred twenty-five trillion, two hundred twenty-one billion, four hundred twenty-four million, one hundred twenty-two thousand, five hundred twenty".