202021101100021 has 8 divisors (see below), whose sum is σ = 230934346790400. Its totient is φ = 173121127507248.

The previous prime is 202021101100003. The next prime is 202021101100043. The reversal of 202021101100021 is 120001101120202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 202021101100021 - 2²⁵ = 202021067545589 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202021101099974 and 202021101100010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202021101106021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3317991781 + ... + 3318052666.

It is an arithmetic number, because the mean of its divisors is an integer number (28866793348800).

Almost surely, 2^{202021101100021} is an apocalyptic number.

It is an amenable number.

202021101100021 is a deficient number, since it is larger than the sum of its proper divisors (28913245690379).

202021101100021 is an equidigital number, since it uses as much as digits as its factorization.

202021101100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6636048803.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 202021101100021 its reverse (120001101120202), we get a palindrome (322022202220223).

The spelling of 202021101100021 in words is "two hundred two trillion, twenty-one billion, one hundred one million, one hundred thousand, twenty-one".