222221110220021 has 16 divisors (see below), whose sum is σ = 243912442952448. Its totient is φ = 200778857198400.

The previous prime is 222221110220009. The next prime is 222221110220077. The reversal of 222221110220021 is 120022011122222.

222221110220021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 222221110220021 - 2¹⁴ = 222221110203637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 222221110219975 and 222221110220002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222221110220621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15835610 + ... + 26366811.

It is an arithmetic number, because the mean of its divisors is an integer number (15244527684528).

Almost surely, 2^{222221110220021} is an apocalyptic number.

It is an amenable number.

222221110220021 is a deficient number, since it is larger than the sum of its proper divisors (21691332732427).

222221110220021 is a wasteful number, since it uses less digits than its factorization.

222221110220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42205372.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 222221110220021 its reverse (120022011122222), we get a palindrome (342243121342243).

The spelling of 222221110220021 in words is "two hundred twenty-two trillion, two hundred twenty-one billion, one hundred ten million, two hundred twenty thousand, twenty-one".