221112120011221 has 4 divisors (see below), whose sum is σ = 222576438686944. Its totient is φ = 219647801335500.

The previous prime is 221112120011161. The next prime is 221112120011269. The reversal of 221112120011221 is 122110021211122.

It is a happy number.

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 221112120011221 - 2⁹ = 221112120010709 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 (221112120011521) 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, 732159337635 + ... + 732159337936.

It is an arithmetic number, because the mean of its divisors is an integer number (55644109671736).

Almost surely, 2^{221112120011221} is an apocalyptic number.

It is an amenable number.

221112120011221 is a deficient number, since it is larger than the sum of its proper divisors (1464318675723).

221112120011221 is a wasteful number, since it uses less digits than its factorization.

221112120011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1464318675722.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 221112120011221 its reverse (122110021211122), we get a palindrome (343222141222343).

The spelling of 221112120011221 in words is "two hundred twenty-one trillion, one hundred twelve billion, one hundred twenty million, eleven thousand, two hundred twenty-one".