21352854273 has 4 divisors (see below), whose sum is σ = 28470472368. Its totient is φ = 14235236180.

The previous prime is 21352854223. The next prime is 21352854283. The reversal of 21352854273 is 37245825312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21352854273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21352854223) 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 in 3 ways as a sum of consecutive naturals, for example, 3558809043 + ... + 3558809048.

It is an arithmetic number, because the mean of its divisors is an integer number (7117618092).

Almost surely, 2^21352854273 is an apocalyptic number.

It is an amenable number.

21352854273 is a deficient number, since it is larger than the sum of its proper divisors (7117618095).

21352854273 is an equidigital number, since it uses as much as digits as its factorization.

21352854273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7117618094.

The product of its digits is 403200, while the sum is 42.

The spelling of 21352854273 in words is "twenty-one billion, three hundred fifty-two million, eight hundred fifty-four thousand, two hundred seventy-three".