21347531203 has 4 divisors (see below), whose sum is σ = 21349252728. Its totient is φ = 21345809680.

The previous prime is 21347531201. The next prime is 21347531207. The reversal of 21347531203 is 30213574312.

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 21347531203 - 2¹ = 21347531201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21347531201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 842026 + ... + 867007.

It is an arithmetic number, because the mean of its divisors is an integer number (5337313182).

Almost surely, 2^21347531203 is an apocalyptic number.

21347531203 is a deficient number, since it is larger than the sum of its proper divisors (1721525).

21347531203 is a wasteful number, since it uses less digits than its factorization.

21347531203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1721524.

The product of its (nonzero) digits is 15120, while the sum is 31.

The spelling of 21347531203 in words is "twenty-one billion, three hundred forty-seven million, five hundred thirty-one thousand, two hundred three".