2120210021021 has 4 divisors (see below), whose sum is σ = 2121003812544. Its totient is φ = 2119416229500.

The previous prime is 2120210021009. The next prime is 2120210021023. The reversal of 2120210021021 is 1201200120212.

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 2120210021021 - 2²⁶ = 2120142912157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2120210020987 and 2120210021005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120210021023) 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, 396891755 + ... + 396897096.

It is an arithmetic number, because the mean of its divisors is an integer number (530250953136).

Almost surely, 2^{2120210021021} is an apocalyptic number.

It is an amenable number.

2120210021021 is a deficient number, since it is larger than the sum of its proper divisors (793791523).

2120210021021 is an equidigital number, since it uses as much as digits as its factorization.

2120210021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793791522.

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

Adding to 2120210021021 its reverse (1201200120212), we get a palindrome (3321410141233).

The spelling of 2120210021021 in words is "two trillion, one hundred twenty billion, two hundred ten million, twenty-one thousand, twenty-one".