2121102010021 has 8 divisors (see below), whose sum is σ = 2134177883264. Its totient is φ = 2108026905120.

The previous prime is 2121102009889. The next prime is 2121102010033. The reversal of 2121102010021 is 1200102011212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121102010021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121102009983 and 2121102010010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121102010091) 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, 5949220 + ... + 6295666.

It is an arithmetic number, because the mean of its divisors is an integer number (266772235408).

Almost surely, 2^{2121102010021} is an apocalyptic number.

It is an amenable number.

2121102010021 is a deficient number, since it is larger than the sum of its proper divisors (13075873243).

2121102010021 is a wasteful number, since it uses less digits than its factorization.

2121102010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384171.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 2121102010021 its reverse (1200102011212), we get a palindrome (3321204021233).

The spelling of 2121102010021 in words is "two trillion, one hundred twenty-one billion, one hundred two million, ten thousand, twenty-one".