2121122002021 has 6 divisors (see below), whose sum is σ = 2331481208966. Its totient is φ = 1928292729000.

The previous prime is 2121122002019. The next prime is 2121122002031. The reversal of 2121122002021 is 1202002211212.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2009629452996 + 111492549025 = 1417614^2 + 333905^2 .

It is not a de Polignac number, because 2121122002021 - 2¹ = 2121122002019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121122001986 and 2121122002004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121122002031) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8764966830 + ... + 8764967071.

Almost surely, 2^{2121122002021} is an apocalyptic number.

It is an amenable number.

2121122002021 is a deficient number, since it is larger than the sum of its proper divisors (210359206945).

2121122002021 is a wasteful number, since it uses less digits than its factorization.

2121122002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17529933923 (or 17529933912 counting only the distinct ones).

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

Adding to 2121122002021 its reverse (1202002211212), we get a palindrome (3323124213233).

The spelling of 2121122002021 in words is "two trillion, one hundred twenty-one billion, one hundred twenty-two million, two thousand, twenty-one".