100405212621 has 32 divisors (see below), whose sum is σ = 162033420288. Its totient is φ = 54060747840.

The previous prime is 100405212617. The next prime is 100405212623. The reversal of 100405212621 is 126212504001.

It is not a de Polignac number, because 100405212621 - 2² = 100405212617 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 100405212591 and 100405212600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100405212623) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1518970 + ... + 1583691.

It is an arithmetic number, because the mean of its divisors is an integer number (5063544384).

Almost surely, 2^100405212621 is an apocalyptic number.

It is an amenable number.

100405212621 is a deficient number, since it is larger than the sum of its proper divisors (61628207667).

100405212621 is a wasteful number, since it uses less digits than its factorization.

100405212621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3102761.

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

Adding to 100405212621 its reverse (126212504001), we get a palindrome (226617716622).

The spelling of 100405212621 in words is "one hundred billion, four hundred five million, two hundred twelve thousand, six hundred twenty-one".