221110221100021 has 4 divisors (see below), whose sum is σ = 241211150290944. Its totient is φ = 201009291909100.

The previous prime is 221110221099997. The next prime is 221110221100033. The reversal of 221110221100021 is 120001122011122.

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 221110221100021 - 2⁷ = 221110221099893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221110221099968 and 221110221100004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221110221100921) 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, 10050464595445 + ... + 10050464595466.

It is an arithmetic number, because the mean of its divisors is an integer number (60302787572736).

Almost surely, 2^{221110221100021} is an apocalyptic number.

It is an amenable number.

221110221100021 is a deficient number, since it is larger than the sum of its proper divisors (20100929190923).

221110221100021 is a wasteful number, since it uses less digits than its factorization.

221110221100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20100929190922.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221110221100021 its reverse (120001122011122), we get a palindrome (341111343111143).

The spelling of 221110221100021 in words is "two hundred twenty-one trillion, one hundred ten billion, two hundred twenty-one million, one hundred thousand, twenty-one".