21221222220112 has 10 divisors (see below), whose sum is σ = 41116118051498. Its totient is φ = 10610611110048.

The previous prime is 21221222220059. The next prime is 21221222220193. The reversal of 21221222220112 is 21102222212212.

It can be written as a sum of positive squares in only one way, i.e., 13726461845776 + 7494760374336 = 3704924^2 + 2737656^2 .

It is a super-3 number, since 3×21221222220112³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 663163194363 + ... + 663163194394.

Almost surely, 2^{21221222220112} is an apocalyptic number.

It is an amenable number.

21221222220112 is a deficient number, since it is larger than the sum of its proper divisors (19894895831386).

21221222220112 is a wasteful number, since it uses less digits than its factorization.

21221222220112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1326326388765 (or 1326326388759 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 21221222220112 its reverse (21102222212212), we get a palindrome (42323444432324).

The spelling of 21221222220112 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred twenty-two million, two hundred twenty thousand, one hundred twelve".