221011202111021 has 16 divisors (see below), whose sum is σ = 265905694416000. Its totient is φ = 179449142404608.

The previous prime is 221011202111009. The next prime is 221011202111039. The reversal of 221011202111021 is 120111202110122.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221011202111021 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 (221011202111081) 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, 84826040 + ... + 87392673.

It is an arithmetic number, because the mean of its divisors is an integer number (16619105901000).

Almost surely, 2^{221011202111021} is an apocalyptic number.

It is an amenable number.

221011202111021 is a deficient number, since it is larger than the sum of its proper divisors (44894492304979).

221011202111021 is a wasteful number, since it uses less digits than its factorization.

221011202111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172228388.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 221011202111021 its reverse (120111202110122), we get a palindrome (341122404221143).

The spelling of 221011202111021 in words is "two hundred twenty-one trillion, eleven billion, two hundred two million, one hundred eleven thousand, twenty-one".