221022110102021 has 4 divisors (see below), whose sum is σ = 224645423382444. Its totient is φ = 217398796821600.

The previous prime is 221022110101999. The next prime is 221022110102047. The reversal of 221022110102021 is 120201011220122.

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

It can be written as a sum of positive squares in 2 ways, for example, as 50203091551396 + 170819018550625 = 7085414^2 + 13069775^2 .

It is a cyclic number.

It is not a de Polignac number, because 221022110102021 - 2⁶ = 221022110101957 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 (221022110102051) 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, 1811656640120 + ... + 1811656640241.

It is an arithmetic number, because the mean of its divisors is an integer number (56161355845611).

Almost surely, 2^{221022110102021} is an apocalyptic number.

It is an amenable number.

221022110102021 is a deficient number, since it is larger than the sum of its proper divisors (3623313280423).

221022110102021 is an equidigital number, since it uses as much as digits as its factorization.

221022110102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3623313280422.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221022110102021 its reverse (120201011220122), we get a palindrome (341223121322143).

The spelling of 221022110102021 in words is "two hundred twenty-one trillion, twenty-two billion, one hundred ten million, one hundred two thousand, twenty-one".