100402131421 has 4 divisors (see below), whose sum is σ = 100414136700. Its totient is φ = 100390126144.

The previous prime is 100402131413. The next prime is 100402131437. The reversal of 100402131421 is 124131204001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124131204001 = 7 ⋅17733029143.

It can be written as a sum of positive squares in 2 ways, for example, as 39646783225 + 60755348196 = 199115^2 + 246486^2 .

It is a cyclic number.

It is not a de Polignac number, because 100402131421 - 2³ = 100402131413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100402131451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5990086 + ... + 6006823.

It is an arithmetic number, because the mean of its divisors is an integer number (25103534175).

Almost surely, 2^100402131421 is an apocalyptic number.

It is an amenable number.

100402131421 is a deficient number, since it is larger than the sum of its proper divisors (12005279).

100402131421 is an equidigital number, since it uses as much as digits as its factorization.

100402131421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12005278.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 100402131421 its reverse (124131204001), we get a palindrome (224533335422).

The spelling of 100402131421 in words is "one hundred billion, four hundred two million, one hundred thirty-one thousand, four hundred twenty-one".