100402021 has 4 divisors (see below), whose sum is σ = 100691712. Its totient is φ = 100112332.

The previous prime is 100402019. The next prime is 100402069. The reversal of 100402021 is 120204001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 100402021 - 2¹ = 100402019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100401989 and 100402007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100402921) 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, 144325 + ... + 145018.

It is an arithmetic number, because the mean of its divisors is an integer number (25172928).

Almost surely, 2^100402021 is an apocalyptic number.

It is an amenable number.

100402021 is a deficient number, since it is larger than the sum of its proper divisors (289691).

100402021 is an equidigital number, since it uses as much as digits as its factorization.

100402021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289690.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 100402021 is about 10020.0808878971. The cubic root of 100402021 is about 464.7800570820.

Adding to 100402021 its reverse (120204001), we get a palindrome (220606022).

The spelling of 100402021 in words is "one hundred million, four hundred two thousand, twenty-one".