2121020121 has 8 divisors (see below), whose sum is σ = 3085120224. Its totient is φ = 1285466720.

The previous prime is 2121020119. The next prime is 2121020137. The reversal of 2121020121 is 1210201212.

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 2121020121 - 2¹ = 2121020119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2121020097 and 2121020106.

It is not an unprimeable number, because it can be changed into a prime (2121020191) 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, 32136636 + ... + 32136701.

It is an arithmetic number, because the mean of its divisors is an integer number (385640028).

Almost surely, 2^2121020121 is an apocalyptic number.

It is an amenable number.

2121020121 is a deficient number, since it is larger than the sum of its proper divisors (964100103).

2121020121 is a wasteful number, since it uses less digits than its factorization.

2121020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64273351.

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

The square root of 2121020121 is about 46054.5342067423. The cubic root of 2121020121 is about 1284.8376749438.

Adding to 2121020121 its reverse (1210201212), we get a palindrome (3331221333).

It can be divided in two parts, 2 and 121020121, that multiplied together give a palindrome (242040242).

The spelling of 2121020121 in words is "two billion, one hundred twenty-one million, twenty thousand, one hundred twenty-one".