21486031273 has 24 divisors (see below), whose sum is σ = 25444123584. Its totient is φ = 17772657120.

The previous prime is 21486031261. The next prime is 21486031327. The reversal of 21486031273 is 37213068412.

It is a happy number.

It is not a de Polignac number, because 21486031273 - 2¹³ = 21486023081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21486041273) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2504890 + ... + 2513452.

It is an arithmetic number, because the mean of its divisors is an integer number (1060171816).

Almost surely, 2^21486031273 is an apocalyptic number.

It is an amenable number.

21486031273 is a deficient number, since it is larger than the sum of its proper divisors (3958092311).

21486031273 is an equidigital number, since it uses as much as digits as its factorization.

21486031273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9005 (or 8974 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 37.

Adding to 21486031273 its reverse (37213068412), we get a palindrome (58699099685).

The spelling of 21486031273 in words is "twenty-one billion, four hundred eighty-six million, thirty-one thousand, two hundred seventy-three".