202100011100021 has 4 divisors (see below), whose sum is σ = 202100856850272. Its totient is φ = 202099165349772.

The previous prime is 202100011099937. The next prime is 202100011100023. The reversal of 202100011100021 is 120001110001202.

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 a de Polignac number, because none of the positive numbers 2^k-202100011100021 is a prime.

It is a super-2 number, since 2×202100011100021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202100011099975 and 202100011100011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202100011100023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 422516585 + ... + 422994638.

It is an arithmetic number, because the mean of its divisors is an integer number (50525214212568).

Almost surely, 2^{202100011100021} is an apocalyptic number.

It is an amenable number.

202100011100021 is a deficient number, since it is larger than the sum of its proper divisors (845750251).

202100011100021 is an equidigital number, since it uses as much as digits as its factorization.

202100011100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 845750250.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 202100011100021 its reverse (120001110001202), we get a palindrome (322101121101223).

The spelling of 202100011100021 in words is "two hundred two trillion, one hundred billion, eleven million, one hundred thousand, twenty-one".