2121010011221 has 16 divisors (see below), whose sum is σ = 2216592518400. Its totient is φ = 2026936968000.

The previous prime is 2121010011173. The next prime is 2121010011223. The reversal of 2121010011221 is 1221100101212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121010011221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121010011196 and 2121010011205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121010011223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9019466 + ... + 9251636.

It is an arithmetic number, because the mean of its divisors is an integer number (138537032400).

Almost surely, 2^{2121010011221} is an apocalyptic number.

It is an amenable number.

2121010011221 is a deficient number, since it is larger than the sum of its proper divisors (95582507179).

2121010011221 is a wasteful number, since it uses less digits than its factorization.

2121010011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235420.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 2121010011221 its reverse (1221100101212), we get a palindrome (3342110112433).

The spelling of 2121010011221 in words is "two trillion, one hundred twenty-one billion, ten million, eleven thousand, two hundred twenty-one".