100021200010021 has 4 divisors (see below), whose sum is σ = 100226582351392. Its totient is φ = 99815817668652.

The previous prime is 100021200010001. The next prime is 100021200010049. The reversal of 100021200010021 is 120010002120001.

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 100021200010021 - 2⁷ = 100021200009893 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 (100021200010001) 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, 102691169955 + ... + 102691170928.

It is an arithmetic number, because the mean of its divisors is an integer number (25056645587848).

Almost surely, 2^{100021200010021} is an apocalyptic number.

It is an amenable number.

100021200010021 is a deficient number, since it is larger than the sum of its proper divisors (205382341371).

100021200010021 is an equidigital number, since it uses as much as digits as its factorization.

100021200010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205382341370.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 100021200010021 its reverse (120010002120001), we get a palindrome (220031202130022).

The spelling of 100021200010021 in words is "one hundred trillion, twenty-one billion, two hundred million, ten thousand, twenty-one".