2121121300021 has 8 divisors (see below), whose sum is σ = 2232909180320. Its totient is φ = 2009348411472.

The previous prime is 2121121299961. The next prime is 2121121300031. The reversal of 2121121300021 is 1200031211212.

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 2121121300021 - 2⁷ = 2121121299893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121121299968 and 2121121300004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121121300031) 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, 3456930 + ... + 4024003.

It is an arithmetic number, because the mean of its divisors is an integer number (279113647540).

Almost surely, 2^{2121121300021} is an apocalyptic number.

It is an amenable number.

2121121300021 is a deficient number, since it is larger than the sum of its proper divisors (111787880299).

2121121300021 is a wasteful number, since it uses less digits than its factorization.

2121121300021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7495875.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 2121121300021 its reverse (1200031211212), we get a palindrome (3321152511233).

The spelling of 2121121300021 in words is "two trillion, one hundred twenty-one billion, one hundred twenty-one million, three hundred thousand, twenty-one".