21351278483 has 4 divisors (see below), whose sum is σ = 21754132848. Its totient is φ = 20948424120.

The previous prime is 21351278453. The next prime is 21351278521. The reversal of 21351278483 is 38487215312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21351278483 - 2¹² = 21351274387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21351278453) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201427103 + ... + 201427208.

It is an arithmetic number, because the mean of its divisors is an integer number (5438533212).

Almost surely, 2^21351278483 is an apocalyptic number.

21351278483 is a deficient number, since it is larger than the sum of its proper divisors (402854365).

21351278483 is an equidigital number, since it uses as much as digits as its factorization.

21351278483 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402854364.

The product of its digits is 322560, while the sum is 44.

The spelling of 21351278483 in words is "twenty-one billion, three hundred fifty-one million, two hundred seventy-eight thousand, four hundred eighty-three".