2120221021021 has 4 divisors (see below), whose sum is σ = 2140805691232. Its totient is φ = 2099636350812.

The previous prime is 2120221020997. The next prime is 2120221021049. The reversal of 2120221021021 is 1201201220212.

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 2120221021021 - 2²¹ = 2120218923869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2120221020986 and 2120221021004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120221721021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10292334951 + ... + 10292335156.

It is an arithmetic number, because the mean of its divisors is an integer number (535201422808).

Almost surely, 2^{2120221021021} is an apocalyptic number.

It is an amenable number.

2120221021021 is a deficient number, since it is larger than the sum of its proper divisors (20584670211).

2120221021021 is a wasteful number, since it uses less digits than its factorization.

2120221021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20584670210.

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

Adding to 2120221021021 its reverse (1201201220212), we get a palindrome (3321422241233).

The spelling of 2120221021021 in words is "two trillion, one hundred twenty billion, two hundred twenty-one million, twenty-one thousand, twenty-one".