125421216 has 48 divisors (see below), whose sum is σ = 333885888. Its totient is φ = 41216000.

The previous prime is 125421211. The next prime is 125421251. The reversal of 125421216 is 612124521.

It is a tau number, because it is divible by the number of its divisors (48).

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

It is not an unprimeable number, because it can be changed into a prime (125421211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2385 + ... + 16016.

It is an arithmetic number, because the mean of its divisors is an integer number (6955956).

Almost surely, 2^125421216 is an apocalyptic number.

125421216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

125421216 is an abundant number, since it is smaller than the sum of its proper divisors (208464672).

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

125421216 is a wasteful number, since it uses less digits than its factorization.

125421216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18485 (or 18477 counting only the distinct ones).

The product of its digits is 960, while the sum is 24.

The square root of 125421216 is about 11199.1613971761. The cubic root of 125421216 is about 500.5609916746.

Adding to 125421216 its reverse (612124521), we get a palindrome (737545737).

The spelling of 125421216 in words is "one hundred twenty-five million, four hundred twenty-one thousand, two hundred sixteen".