221320320121111 has 4 divisors (see below), whose sum is σ = 223062999807232. Its totient is φ = 219577640434992.

The previous prime is 221320320121097. The next prime is 221320320121141. The reversal of 221320320121111 is 111121023023122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221320320121111 is a prime.

It is a super-2 number, since 2×221320320121111² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221320320121141) 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, 871339842870 + ... + 871339843123.

It is an arithmetic number, because the mean of its divisors is an integer number (55765749951808).

Almost surely, 2^{221320320121111} is an apocalyptic number.

221320320121111 is a deficient number, since it is larger than the sum of its proper divisors (1742679686121).

221320320121111 is a wasteful number, since it uses less digits than its factorization.

221320320121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1742679686120.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 221320320121111 its reverse (111121023023122), we get a palindrome (332441343144233).

The spelling of 221320320121111 in words is "two hundred twenty-one trillion, three hundred twenty billion, three hundred twenty million, one hundred twenty-one thousand, one hundred eleven".