2120121021 has 8 divisors (see below), whose sum is σ = 2832961824. Its totient is φ = 1410347120.

The previous prime is 2120121011. The next prime is 2120121077. The reversal of 2120121021 is 1201210212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2120121021 - 2¹⁵ = 2120088253 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2120120988 and 2120121006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120121011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 765111 + ... + 767876.

It is an arithmetic number, because the mean of its divisors is an integer number (354120228).

Almost surely, 2^2120121021 is an apocalyptic number.

It is an amenable number.

2120121021 is a deficient number, since it is larger than the sum of its proper divisors (712840803).

2120121021 is a wasteful number, since it uses less digits than its factorization.

2120121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1533451.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 2120121021 is about 46044.7719182102. The cubic root of 2120121021 is about 1284.6561018083.

Adding to 2120121021 its reverse (1201210212), we get a palindrome (3321331233).

It can be divided in two parts, 2 and 120121021, that multiplied together give a palindrome (240242042).

The spelling of 2120121021 in words is "two billion, one hundred twenty million, one hundred twenty-one thousand, twenty-one".