21345114253 has 4 divisors (see below), whose sum is σ = 21354599008. Its totient is φ = 21335629500.

The previous prime is 21345114239. The next prime is 21345114277. The reversal of 21345114253 is 35241154312.

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 21345114253 - 2¹³ = 21345106061 is a prime.

It is a super-2 number, since 2×21345114253² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21345114353) 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, 4739001 + ... + 4743502.

It is an arithmetic number, because the mean of its divisors is an integer number (5338649752).

Almost surely, 2^21345114253 is an apocalyptic number.

It is an amenable number.

21345114253 is a deficient number, since it is larger than the sum of its proper divisors (9484755).

21345114253 is an equidigital number, since it uses as much as digits as its factorization.

21345114253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9484754.

The product of its digits is 14400, while the sum is 31.

Adding to 21345114253 its reverse (35241154312), we get a palindrome (56586268565).

The spelling of 21345114253 in words is "twenty-one billion, three hundred forty-five million, one hundred fourteen thousand, two hundred fifty-three".