202211002100021 has 12 divisors (see below), whose sum is σ = 215050391356068. Its totient is φ = 190099228780032.

The previous prime is 202211002100011. The next prime is 202211002100033. The reversal of 202211002100021 is 120001200112202.

It can be written as a sum of positive squares in 6 ways, for example, as 4361853135025 + 197849148964996 = 2088505^2 + 14065886^2 .

It is not a de Polignac number, because 202211002100021 - 2⁶ = 202211002099957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202211002099969 and 202211002100005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202211002100011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 398658776 + ... + 399165681.

It is an arithmetic number, because the mean of its divisors is an integer number (17920865946339).

Almost surely, 2^{202211002100021} is an apocalyptic number.

It is an amenable number.

202211002100021 is a deficient number, since it is larger than the sum of its proper divisors (12839389256047).

202211002100021 is an equidigital number, since it uses as much as digits as its factorization.

202211002100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797825368 (or 797825351 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 202211002100021 its reverse (120001200112202), we get a palindrome (322212202212223).

The spelling of 202211002100021 in words is "two hundred two trillion, two hundred eleven billion, two million, one hundred thousand, twenty-one".