2120122021121 has 4 divisors (see below), whose sum is σ = 2283208330452. Its totient is φ = 1957035711792.

The previous prime is 2120122021093. The next prime is 2120122021123. The reversal of 2120122021121 is 1211202210212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 487001601025 + 1633120420096 = 697855^2 + 1277936^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120122021121 - 2⁶ = 2120122021057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2120122021121.

It is not an unprimeable number, because it can be changed into a prime (2120122021123) 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, 81543154646 + ... + 81543154671.

It is an arithmetic number, because the mean of its divisors is an integer number (570802082613).

Almost surely, 2^{2120122021121} is an apocalyptic number.

It is an amenable number.

2120122021121 is a deficient number, since it is larger than the sum of its proper divisors (163086309331).

2120122021121 is a wasteful number, since it uses less digits than its factorization.

2120122021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163086309330.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2120122021121 its reverse (1211202210212), we get a palindrome (3331324231333).

The spelling of 2120122021121 in words is "two trillion, one hundred twenty billion, one hundred twenty-two million, twenty-one thousand, one hundred twenty-one".