21035134253 has 8 divisors (see below), whose sum is σ = 24869124480. Its totient is φ = 17408386800.

The previous prime is 21035134199. The next prime is 21035134271. The reversal of 21035134253 is 35243153012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21035134253 - 2¹² = 21035130157 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21035134273) 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 7 ways as a sum of consecutive naturals, for example, 51810473 + ... + 51810878.

It is an arithmetic number, because the mean of its divisors is an integer number (3108640560).

Almost surely, 2^21035134253 is an apocalyptic number.

It is an amenable number.

21035134253 is a deficient number, since it is larger than the sum of its proper divisors (3833990227).

21035134253 is a wasteful number, since it uses less digits than its factorization.

21035134253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103621387.

The product of its (nonzero) digits is 10800, while the sum is 29.

Adding to 21035134253 its reverse (35243153012), we get a palindrome (56278287265).

The spelling of 21035134253 in words is "twenty-one billion, thirty-five million, one hundred thirty-four thousand, two hundred fifty-three".