21421134373 has 2 divisors, whose sum is σ = 21421134374. Its totient is φ = 21421134372.

The previous prime is 21421134347. The next prime is 21421134443. The reversal of 21421134373 is 37343112412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20902798084 + 518336289 = 144578^2 + 22767^2 .

It is a cyclic number.

It is not a de Polignac number, because 21421134373 - 2¹⁷ = 21421003301 is a prime.

It is a super-2 number, since 2×21421134373² (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 (21421134313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10710567186 + 10710567187.

It is an arithmetic number, because the mean of its divisors is an integer number (10710567187).

Almost surely, 2^21421134373 is an apocalyptic number.

It is an amenable number.

21421134373 is a deficient number, since it is larger than the sum of its proper divisors (1).

21421134373 is an equidigital number, since it uses as much as digits as its factorization.

21421134373 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 31.

Adding to 21421134373 its reverse (37343112412), we get a palindrome (58764246785).

The spelling of 21421134373 in words is "twenty-one billion, four hundred twenty-one million, one hundred thirty-four thousand, three hundred seventy-three".