21021001202101 has 12 divisors (see below), whose sum is σ = 21778283755200. Its totient is φ = 20289228828120.

The previous prime is 21021001202081. The next prime is 21021001202119. The reversal of 21021001202101 is 10120210012012.

It is not a de Polignac number, because 21021001202101 - 2²¹ = 21020999104949 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 (21021001202801) 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, 28493421 + ... + 29221858.

It is an arithmetic number, because the mean of its divisors is an integer number (1814856979600).

Almost surely, 2^{21021001202101} is an apocalyptic number.

It is an amenable number.

21021001202101 is a deficient number, since it is larger than the sum of its proper divisors (757282553099).

21021001202101 is an equidigital number, since it uses as much as digits as its factorization.

21021001202101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57715720 (or 57715689 counting only the distinct ones).

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

Adding to 21021001202101 its reverse (10120210012012), we get a palindrome (31141211214113).

The spelling of 21021001202101 in words is "twenty-one trillion, twenty-one billion, one million, two hundred two thousand, one hundred one".