21152421341 has 2 divisors, whose sum is σ = 21152421342. Its totient is φ = 21152421340.

The previous prime is 21152421313. The next prime is 21152421349. The reversal of 21152421341 is 14312425112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10618478116 + 10533943225 = 103046^2 + 102635^2 .

It is a cyclic number.

It is not a de Polignac number, because 21152421341 - 2²⁶ = 21085312477 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21152421341.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21152421349) 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, 10576210670 + 10576210671.

It is an arithmetic number, because the mean of its divisors is an integer number (10576210671).

Almost surely, 2^21152421341 is an apocalyptic number.

It is an amenable number.

21152421341 is a deficient number, since it is larger than the sum of its proper divisors (1).

21152421341 is an equidigital number, since it uses as much as digits as its factorization.

21152421341 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1920, while the sum is 26.

Adding to 21152421341 its reverse (14312425112), we get a palindrome (35464846453).

The spelling of 21152421341 in words is "twenty-one billion, one hundred fifty-two million, four hundred twenty-one thousand, three hundred forty-one".