221020120100111 has 4 divisors (see below), whose sum is σ = 222503476611000. Its totient is φ = 219536763589224.

The previous prime is 221020120100089. The next prime is 221020120100113. The reversal of 221020120100111 is 111001021020122.

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-221020120100111 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 (221020120100113) 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, 741678255221 + ... + 741678255518.

It is an arithmetic number, because the mean of its divisors is an integer number (55625869152750).

Almost surely, 2^{221020120100111} is an apocalyptic number.

221020120100111 is a deficient number, since it is larger than the sum of its proper divisors (1483356510889).

221020120100111 is a wasteful number, since it uses less digits than its factorization.

221020120100111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1483356510888.

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

Adding to 221020120100111 its reverse (111001021020122), we get a palindrome (332021141120233).

The spelling of 221020120100111 in words is "two hundred twenty-one trillion, twenty billion, one hundred twenty million, one hundred thousand, one hundred eleven".