211221023221 has 32 divisors (see below), whose sum is σ = 240743148800. Its totient is φ = 183708933120.

The previous prime is 211221023179. The next prime is 211221023239. The reversal of 211221023221 is 122320122112.

It is a cyclic number.

It is not a de Polignac number, because 211221023221 - 2⁷ = 211221023093 is a prime.

It is a super-2 number, since 2×211221023221² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211221023291) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59346640 + ... + 59350198.

It is an arithmetic number, because the mean of its divisors is an integer number (7523223400).

Almost surely, 2^211221023221 is an apocalyptic number.

It is an amenable number.

211221023221 is a deficient number, since it is larger than the sum of its proper divisors (29522125579).

211221023221 is a wasteful number, since it uses less digits than its factorization.

211221023221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4829.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 211221023221 its reverse (122320122112), we get a palindrome (333541145333).

The spelling of 211221023221 in words is "two hundred eleven billion, two hundred twenty-one million, twenty-three thousand, two hundred twenty-one".