21122222141 has 2 divisors, whose sum is σ = 21122222142. Its totient is φ = 21122222140.

The previous prime is 21122222131. The next prime is 21122222207. The reversal of 21122222141 is 14122222112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17691660100 + 3430562041 = 133010^2 + 58571^2 .

It is a cyclic number.

It is not a de Polignac number, because 21122222141 - 2¹⁸ = 21121959997 is a prime.

It is a super-2 number, since 2×21122222141² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21122222111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561111070 + 10561111071.

It is an arithmetic number, because the mean of its divisors is an integer number (10561111071).

Almost surely, 2^21122222141 is an apocalyptic number.

It is an amenable number.

21122222141 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122222141 is an equidigital number, since it uses as much as digits as its factorization.

21122222141 is an evil number, because the sum of its binary digits is even.

The product of its digits is 256, while the sum is 20.

Adding to 21122222141 its reverse (14122222112), we get a palindrome (35244444253).

The spelling of 21122222141 in words is "twenty-one billion, one hundred twenty-two million, two hundred twenty-two thousand, one hundred forty-one".