125017221042 has 160 divisors (see below), whose sum is σ = 337226419200. Its totient is φ = 34566497280.

The previous prime is 125017221013. The next prime is 125017221047. The reversal of 125017221042 is 240122710521.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 125017220997 and 125017221015.

It is not an unprimeable number, because it can be changed into a prime (125017221047) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1686258 + ... + 1758834.

It is an arithmetic number, because the mean of its divisors is an integer number (2107665120).

Almost surely, 2^125017221042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 125017221042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (168613209600).

125017221042 is an abundant number, since it is smaller than the sum of its proper divisors (212209198158).

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

125017221042 is an equidigital number, since it uses as much as digits as its factorization.

125017221042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72643 (or 72620 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

Adding to 125017221042 its reverse (240122710521), we get a palindrome (365139931563).

The spelling of 125017221042 in words is "one hundred twenty-five billion, seventeen million, two hundred twenty-one thousand, forty-two".