221020111021111 has 32 divisors (see below), whose sum is σ = 240028659763200. Its totient is φ = 203005049600640.

The previous prime is 221020111021081. The next prime is 221020111021121. The reversal of 221020111021111 is 111120111020122.

It is not a de Polignac number, because 221020111021111 - 2¹⁷ = 221020110890039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221020111021121) 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, 1278572961 + ... + 1278745813.

It is an arithmetic number, because the mean of its divisors is an integer number (7500895617600).

Almost surely, 2^{221020111021111} is an apocalyptic number.

221020111021111 is a deficient number, since it is larger than the sum of its proper divisors (19008548742089).

221020111021111 is a wasteful number, since it uses less digits than its factorization.

221020111021111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197079.

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

Adding to 221020111021111 its reverse (111120111020122), we get a palindrome (332140222041233).

The spelling of 221020111021111 in words is "two hundred twenty-one trillion, twenty billion, one hundred eleven million, twenty-one thousand, one hundred eleven".