100940279521 has 3 divisors (see below), whose sum is σ = 100940597233. Its totient is φ = 100939961810.

The previous prime is 100940279513. The next prime is 100940279527. The reversal of 100940279521 is 125972049001.

It is a happy number.

The square root of 100940279521 is 317711.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 125972049001 = 37 ⋅3404649973.

It is not a de Polignac number, because 100940279521 - 2³ = 100940279513 is a prime.

It is a super-2 number, since 2×100940279521² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100940279527) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 158856 + ... + 476566.

Almost surely, 2^100940279521 is an apocalyptic number.

100940279521 is the 317711-st square number.

100940279521 is the 158856-th centered octagonal number.

It is an amenable number.

100940279521 is a deficient number, since it is larger than the sum of its proper divisors (317712).

100940279521 is an frugal number, since it uses more digits than its factorization.

100940279521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635422 (or 317711 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 40.

The spelling of 100940279521 in words is "one hundred billion, nine hundred forty million, two hundred seventy-nine thousand, five hundred twenty-one".