100420521125 has 8 divisors (see below), whose sum is σ = 125324810520. Its totient is φ = 80336416800.

The previous prime is 100420521079. The next prime is 100420521161. The reversal of 100420521125 is 521125024001.

It can be written as a sum of positive squares in 4 ways, for example, as 20911184449 + 79509336676 = 144607^2 + 281974^2 .

It is a de Polignac number, because none of the positive numbers 2^k-100420521125 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 100420521125.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 401681960 + ... + 401682209.

It is an arithmetic number, because the mean of its divisors is an integer number (15665601315).

Almost surely, 2^100420521125 is an apocalyptic number.

It is an amenable number.

100420521125 is a deficient number, since it is larger than the sum of its proper divisors (24904289395).

100420521125 is an frugal number, since it uses more digits than its factorization.

100420521125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803364184 (or 803364174 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 23.

Adding to 100420521125 its reverse (521125024001), we get a palindrome (621545545126).

The spelling of 100420521125 in words is "one hundred billion, four hundred twenty million, five hundred twenty-one thousand, one hundred twenty-five".