21313231053 has 4 divisors (see below), whose sum is σ = 28417641408. Its totient is φ = 14208820700.

The previous prime is 21313231003. The next prime is 21313231067. The reversal of 21313231053 is 35013231312.

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 not a de Polignac number, because 21313231053 - 2²¹ = 21311133901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21313231003) 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, 3552205173 + ... + 3552205178.

It is an arithmetic number, because the mean of its divisors is an integer number (7104410352).

Almost surely, 2^21313231053 is an apocalyptic number.

It is an amenable number.

21313231053 is a deficient number, since it is larger than the sum of its proper divisors (7104410355).

21313231053 is an equidigital number, since it uses as much as digits as its factorization.

21313231053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7104410354.

The product of its (nonzero) digits is 1620, while the sum is 24.

Adding to 21313231053 its reverse (35013231312), we get a palindrome (56326462365).

The spelling of 21313231053 in words is "twenty-one billion, three hundred thirteen million, two hundred thirty-one thousand, fifty-three".