21221223113111 has 16 divisors (see below), whose sum is σ = 24483353117184. Its totient is φ = 18016778463264.

The previous prime is 21221223113089. The next prime is 21221223113147. The reversal of 21221223113111 is 11131132212212.

It is not a de Polignac number, because 21221223113111 - 2¹⁴ = 21221223096727 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 (21221223113191) 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, 2517521 + ... + 6984293.

It is an arithmetic number, because the mean of its divisors is an integer number (1530209569824).

Almost surely, 2^{21221223113111} is an apocalyptic number.

21221223113111 is a deficient number, since it is larger than the sum of its proper divisors (3262130004073).

21221223113111 is a wasteful number, since it uses less digits than its factorization.

21221223113111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4473230.

The product of its digits is 288, while the sum is 23.

Adding to 21221223113111 its reverse (11131132212212), we get a palindrome (32352355325323).

The spelling of 21221223113111 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred twenty-three million, one hundred thirteen thousand, one hundred eleven".