221213022011 has 4 divisors (see below), whose sum is σ = 221341561224. Its totient is φ = 221084482800.

The previous prime is 221213021993. The next prime is 221213022061. The reversal of 221213022011 is 110220312122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221213022011 - 2¹⁴ = 221213005627 is a prime.

It is a super-2 number, since 2×221213022011² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221213022061) 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, 64267025 + ... + 64270466.

It is an arithmetic number, because the mean of its divisors is an integer number (55335390306).

Almost surely, 2^221213022011 is an apocalyptic number.

221213022011 is a deficient number, since it is larger than the sum of its proper divisors (128539213).

221213022011 is a wasteful number, since it uses less digits than its factorization.

221213022011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128539212.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 221213022011 its reverse (110220312122), we get a palindrome (331433334133).

The spelling of 221213022011 in words is "two hundred twenty-one billion, two hundred thirteen million, twenty-two thousand, eleven".