2021102210021 has 4 divisors (see below), whose sum is σ = 2032393284000. Its totient is φ = 2009811136044.

The previous prime is 2021102209993. The next prime is 2021102210069. The reversal of 2021102210021 is 1200122011202.

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 2021102210021 - 2³⁰ = 2020028468197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2021102209978 and 2021102210005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021102210521) 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, 5645536721 + ... + 5645537078.

It is an arithmetic number, because the mean of its divisors is an integer number (508098321000).

Almost surely, 2^{2021102210021} is an apocalyptic number.

It is an amenable number.

2021102210021 is a deficient number, since it is larger than the sum of its proper divisors (11291073979).

2021102210021 is a wasteful number, since it uses less digits than its factorization.

2021102210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11291073978.

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

Adding to 2021102210021 its reverse (1200122011202), we get a palindrome (3221224221223).

The spelling of 2021102210021 in words is "two trillion, twenty-one billion, one hundred two million, two hundred ten thousand, twenty-one".