221111100122021 has 4 divisors (see below), whose sum is σ = 224411265795552. Its totient is φ = 217810934448492.

The previous prime is 221111100121997. The next prime is 221111100122053. The reversal of 221111100122021 is 120221001111122.

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 221111100122021 - 2²² = 221111095927717 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 (221111100172021) 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, 1650082836665 + ... + 1650082836798.

It is an arithmetic number, because the mean of its divisors is an integer number (56102816448888).

Almost surely, 2^{221111100122021} is an apocalyptic number.

It is an amenable number.

221111100122021 is a deficient number, since it is larger than the sum of its proper divisors (3300165673531).

221111100122021 is an equidigital number, since it uses as much as digits as its factorization.

221111100122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3300165673530.

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

Adding to 221111100122021 its reverse (120221001111122), we get a palindrome (341332101233143).

The spelling of 221111100122021 in words is "two hundred twenty-one trillion, one hundred eleven billion, one hundred million, one hundred twenty-two thousand, twenty-one".