2221121022221 has 4 divisors (see below), whose sum is σ = 2317691501472. Its totient is φ = 2124550542972.

The previous prime is 2221121022199. The next prime is 2221121022271. The reversal of 2221121022221 is 1222201211222.

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 2221121022221 - 2³⁸ = 1946243115277 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2221121022193 and 2221121022202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221121022271) 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, 48285239591 + ... + 48285239636.

It is an arithmetic number, because the mean of its divisors is an integer number (579422875368).

Almost surely, 2^{2221121022221} is an apocalyptic number.

It is an amenable number.

2221121022221 is a deficient number, since it is larger than the sum of its proper divisors (96570479251).

2221121022221 is an equidigital number, since it uses as much as digits as its factorization.

2221121022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96570479250.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 2221121022221 its reverse (1222201211222), we get a palindrome (3443322233443).

The spelling of 2221121022221 in words is "two trillion, two hundred twenty-one billion, one hundred twenty-one million, twenty-two thousand, two hundred twenty-one".