2120122210021 has 4 divisors (see below), whose sum is σ = 2122429199200. Its totient is φ = 2117815220844.

The previous prime is 2120122210013. The next prime is 2120122210033. The reversal of 2120122210021 is 1200122210212.

It is a happy number.

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 2120122210021 - 2³ = 2120122210013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2120122209977 and 2120122210004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120122210721) 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, 1153493211 + ... + 1153495048.

It is an arithmetic number, because the mean of its divisors is an integer number (530607299800).

Almost surely, 2^{2120122210021} is an apocalyptic number.

It is an amenable number.

2120122210021 is a deficient number, since it is larger than the sum of its proper divisors (2306989179).

2120122210021 is an equidigital number, since it uses as much as digits as its factorization.

2120122210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2306989178.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2120122210021 its reverse (1200122210212), we get a palindrome (3320244420233).

The spelling of 2120122210021 in words is "two trillion, one hundred twenty billion, one hundred twenty-two million, two hundred ten thousand, twenty-one".