2121021222113 has 4 divisors (see below), whose sum is σ = 2189441261568. Its totient is φ = 2052601182660.

The previous prime is 2121021222109. The next prime is 2121021222139. The reversal of 2121021222113 is 3112221201212.

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 2121021222113 - 2² = 2121021222109 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121021222193) 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, 34210019681 + ... + 34210019742.

It is an arithmetic number, because the mean of its divisors is an integer number (547360315392).

Almost surely, 2^{2121021222113} is an apocalyptic number.

It is an amenable number.

2121021222113 is a deficient number, since it is larger than the sum of its proper divisors (68420039455).

2121021222113 is an equidigital number, since it uses as much as digits as its factorization.

2121021222113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68420039454.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 2121021222113 its reverse (3112221201212), we get a palindrome (5233242423325).

The spelling of 2121021222113 in words is "two trillion, one hundred twenty-one billion, twenty-one million, two hundred twenty-two thousand, one hundred thirteen".