21121232141 has 2 divisors, whose sum is σ = 21121232142. Its totient is φ = 21121232140.

The previous prime is 21121232113. The next prime is 21121232159. The reversal of 21121232141 is 14123212112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20790756100 + 330476041 = 144190^2 + 18179^2 .

It is a cyclic number.

It is not a de Polignac number, because 21121232141 - 2¹⁸ = 21120969997 is a prime.

It is a super-2 number, since 2×21121232141² (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 (21121231141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560616070 + 10560616071.

It is an arithmetic number, because the mean of its divisors is an integer number (10560616071).

Almost surely, 2^21121232141 is an apocalyptic number.

It is an amenable number.

21121232141 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121232141 is an equidigital number, since it uses as much as digits as its factorization.

21121232141 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192, while the sum is 20.

Adding to 21121232141 its reverse (14123212112), we get a palindrome (35244444253).

The spelling of 21121232141 in words is "twenty-one billion, one hundred twenty-one million, two hundred thirty-two thousand, one hundred forty-one".