2121221012101 has 4 divisors (see below), whose sum is σ = 2124715610752. Its totient is φ = 2117726413452.

The previous prime is 2121221012087. The next prime is 2121221012107. The reversal of 2121221012101 is 1012101221212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2121221012101 - 2²⁹ = 2120684141189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121221012107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1747298415 + ... + 1747299628.

It is an arithmetic number, because the mean of its divisors is an integer number (531178902688).

Almost surely, 2^{2121221012101} is an apocalyptic number.

It is an amenable number.

2121221012101 is a deficient number, since it is larger than the sum of its proper divisors (3494598651).

2121221012101 is an equidigital number, since it uses as much as digits as its factorization.

2121221012101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3494598650.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 2121221012101 its reverse (1012101221212), we get a palindrome (3133322233313).

The spelling of 2121221012101 in words is "two trillion, one hundred twenty-one billion, two hundred twenty-one million, twelve thousand, one hundred one".