100392021409 has 3 divisors (see below), whose sum is σ = 100392338257.
Its totient is φ = 100391704562.
The previous prime is 100392021397. The next prime is 100392021413. The reversal of 100392021409 is 904120293001.
The square root of 100392021409 is 316847.
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.
It is not a de Polignac number, because 100392021409 - 25 = 100392021377 is a prime.
It is a super-2 number, since 2×1003920214092 (a number of 23 digits) contains 22 as substring.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (100392021469) 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, 158424 + ... + 475270.
Almost surely, 2100392021409 is an apocalyptic number.
100392021409 is the 316847-th square number.
100392021409 is the 158424-th centered octagonal number.
It is an amenable number.
100392021409 is a deficient number, since it is larger than the sum of its proper divisors (316848).
100392021409 is an frugal number, since it uses more digits than its factorization.
100392021409 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 633694 (or 316847 counting only the distinct ones).
The product of its (nonzero) digits is 3888, while the sum is 31.
The spelling of 100392021409 in words is "one hundred billion, three hundred ninety-two million, twenty-one thousand, four hundred nine".