20110221111 has 16 divisors (see below), whose sum is σ = 28470009600. Its totient is φ = 12583018368.

The previous prime is 20110221083. The next prime is 20110221127. The reversal of 20110221111 is 11112201102.

It is a de Polignac number, because none of the positive numbers 2^k-20110221111 is a prime.

It is a super-4 number, since 4×20110221111⁴ (a number of 42 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20110221151) 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, 530881 + ... + 567498.

It is an arithmetic number, because the mean of its divisors is an integer number (1779375600).

Almost surely, 2^20110221111 is an apocalyptic number.

20110221111 is a deficient number, since it is larger than the sum of its proper divisors (8359788489).

20110221111 is a wasteful number, since it uses less digits than its factorization.

20110221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1098758.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 20110221111 its reverse (11112201102), we get a palindrome (31222422213).

The spelling of 20110221111 in words is "twenty billion, one hundred ten million, two hundred twenty-one thousand, one hundred eleven".