221020011101211 has 64 divisors (see below), whose sum is σ = 342640394342400. Its totient is φ = 124120178896896.

The previous prime is 221020011101119. The next prime is 221020011101249. The reversal of 221020011101211 is 112101110020122.

It is a happy number.

It is not a de Polignac number, because 221020011101211 - 2²⁹ = 221019474230299 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221020011102211) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 353620485 + ... + 354244953.

It is an arithmetic number, because the mean of its divisors is an integer number (5353756161600).

Almost surely, 2^{221020011101211} is an apocalyptic number.

221020011101211 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

221020011101211 is a deficient number, since it is larger than the sum of its proper divisors (121620383241189).

221020011101211 is a wasteful number, since it uses less digits than its factorization.

221020011101211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625548.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 221020011101211 its reverse (112101110020122), we get a palindrome (333121121121333).

The spelling of 221020011101211 in words is "two hundred twenty-one trillion, twenty billion, eleven million, one hundred one thousand, two hundred eleven".