221011100021 has 4 divisors (see below), whose sum is σ = 232643263200. Its totient is φ = 209378936844.

The previous prime is 221011100017. The next prime is 221011100027. The reversal of 221011100021 is 120001110122.

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 221011100021 - 2² = 221011100017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221011099975 and 221011100011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221011100027) 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, 5816081561 + ... + 5816081598.

It is an arithmetic number, because the mean of its divisors is an integer number (58160815800).

Almost surely, 2^221011100021 is an apocalyptic number.

It is an amenable number.

221011100021 is a deficient number, since it is larger than the sum of its proper divisors (11632163179).

221011100021 is a wasteful number, since it uses less digits than its factorization.

221011100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11632163178.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 221011100021 its reverse (120001110122), we get a palindrome (341012210143).

The spelling of 221011100021 in words is "two hundred twenty-one billion, eleven million, one hundred thousand, twenty-one".