21402254141 has 2 divisors, whose sum is σ = 21402254142. Its totient is φ = 21402254140.

The previous prime is 21402254131. The next prime is 21402254171. The reversal of 21402254141 is 14145220412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14416804900 + 6985449241 = 120070^2 + 83579^2 .

It is a cyclic number.

It is not a de Polignac number, because 21402254141 - 2¹⁴ = 21402237757 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21402254141.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21402254131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10701127070 + 10701127071.

It is an arithmetic number, because the mean of its divisors is an integer number (10701127071).

Almost surely, 2^21402254141 is an apocalyptic number.

It is an amenable number.

21402254141 is a deficient number, since it is larger than the sum of its proper divisors (1).

21402254141 is an equidigital number, since it uses as much as digits as its factorization.

21402254141 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2560, while the sum is 26.

Adding to 21402254141 its reverse (14145220412), we get a palindrome (35547474553).

The spelling of 21402254141 in words is "twenty-one billion, four hundred two million, two hundred fifty-four thousand, one hundred forty-one".