21113002535 has 8 divisors (see below), whose sum is σ = 25338706416. Its totient is φ = 16888333120.

The previous prime is 21113002517. The next prime is 21113002541. The reversal of 21113002535 is 53520031112.

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 21113002535 - 2¹⁴ = 21112986151 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21113002535.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 212981 + ... + 295950.

It is an arithmetic number, because the mean of its divisors is an integer number (3167338302).

Almost surely, 2^21113002535 is an apocalyptic number.

21113002535 is a deficient number, since it is larger than the sum of its proper divisors (4225703881).

21113002535 is an equidigital number, since it uses as much as digits as its factorization.

21113002535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517233.

The product of its (nonzero) digits is 900, while the sum is 23.

Adding to 21113002535 its reverse (53520031112), we get a palindrome (74633033647).

The spelling of 21113002535 in words is "twenty-one billion, one hundred thirteen million, two thousand, five hundred thirty-five".