221011221112021 has 8 divisors (see below), whose sum is σ = 235502402716440. Its totient is φ = 206685653011968.

The previous prime is 221011221111917. The next prime is 221011221112061. The reversal of 221011221112021 is 120211122110122.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3333950979921 + 217677270132100 = 1825911^2 + 14753890^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221011221112021 - 2⁷ = 221011221111893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221011221112021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221011221112061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41403373336 + ... + 41403378673.

It is an arithmetic number, because the mean of its divisors is an integer number (29437800339555).

Almost surely, 2^{221011221112021} is an apocalyptic number.

It is an amenable number.

221011221112021 is a deficient number, since it is larger than the sum of its proper divisors (14491181604419).

221011221112021 is a wasteful number, since it uses less digits than its factorization.

221011221112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82806752183.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 221011221112021 its reverse (120211122110122), we get a palindrome (341222343222143).

The spelling of 221011221112021 in words is "two hundred twenty-one trillion, eleven billion, two hundred twenty-one million, one hundred twelve thousand, twenty-one".