21134253013 has 4 divisors (see below), whose sum is σ = 21371716620. Its totient is φ = 20896789408.

The previous prime is 21134252989. The next prime is 21134253037. The reversal of 21134253013 is 31035243112.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (21134252989) and next prime (21134253037).

It can be written as a sum of positive squares in 2 ways, for example, as 4703627889 + 16430625124 = 68583^2 + 128182^2 .

It is a cyclic number.

It is not a de Polignac number, because 21134253013 - 2¹³ = 21134244821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21134253083) 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, 118731670 + ... + 118731847.

It is an arithmetic number, because the mean of its divisors is an integer number (5342929155).

Almost surely, 2^21134253013 is an apocalyptic number.

It is an amenable number.

21134253013 is a deficient number, since it is larger than the sum of its proper divisors (237463607).

21134253013 is an equidigital number, since it uses as much as digits as its factorization.

21134253013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237463606.

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 21134253013 its reverse (31035243112), we get a palindrome (52169496125).

Subtracting 21134253013 from its reverse (31035243112), we obtain a palindrome (9900990099).

The spelling of 21134253013 in words is "twenty-one billion, one hundred thirty-four million, two hundred fifty-three thousand, thirteen".