21320126732281 has 48 divisors (see below), whose sum is σ = 23829103791360. Its totient is φ = 19052475886080.

The previous prime is 21320126732243. The next prime is 21320126732299. The reversal of 21320126732281 is 18223762102312.

It is a happy number.

It is not a de Polignac number, because 21320126732281 - 2³¹ = 21317979248633 is a prime.

It is a super-2 number, since 2×21320126732281² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21320126732381) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1021410861 + ... + 1021431733.

It is an arithmetic number, because the mean of its divisors is an integer number (496439662320).

Almost surely, 2^{21320126732281} is an apocalyptic number.

It is an amenable number.

21320126732281 is a deficient number, since it is larger than the sum of its proper divisors (2508977059079).

21320126732281 is a wasteful number, since it uses less digits than its factorization.

21320126732281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21746 (or 21733 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 40.

Adding to 21320126732281 its reverse (18223762102312), we get a palindrome (39543888834593).

The spelling of 21320126732281 in words is "twenty-one trillion, three hundred twenty billion, one hundred twenty-six million, seven hundred thirty-two thousand, two hundred eighty-one".