21112222141 has 2 divisors, whose sum is σ = 21112222142. Its totient is φ = 21112222140.

The previous prime is 21112222121. The next prime is 21112222147. The reversal of 21112222141 is 14122221112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17038080900 + 4074141241 = 130530^2 + 63829^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112222141 - 2²⁷ = 20978004413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21112222147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556111070 + 10556111071.

It is an arithmetic number, because the mean of its divisors is an integer number (10556111071).

Almost surely, 2^21112222141 is an apocalyptic number.

It is an amenable number.

21112222141 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112222141 is an equidigital number, since it uses as much as digits as its factorization.

21112222141 is an evil number, because the sum of its binary digits is even.

The product of its digits is 128, while the sum is 19.

Adding to 21112222141 its reverse (14122221112), we get a palindrome (35234443253).

It can be divided in two parts, 21112 and 222141, that added together give a triangular number (243253 = T₆₉₇).

The spelling of 21112222141 in words is "twenty-one billion, one hundred twelve million, two hundred twenty-two thousand, one hundred forty-one".