21145010135 has 4 divisors (see below), whose sum is σ = 25374012168. Its totient is φ = 16916008104.

The previous prime is 21145010123. The next prime is 21145010143. The reversal of 21145010135 is 53101054112.

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

It is a cyclic number.

It is not a de Polignac number, because 21145010135 - 2¹⁰ = 21145009111 is a prime.

It is a super-2 number, since 2×21145010135² (a number of 21 digits) contains 22 as substring.

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 21145010135.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2114501009 + ... + 2114501018.

It is an arithmetic number, because the mean of its divisors is an integer number (6343503042).

Almost surely, 2^21145010135 is an apocalyptic number.

21145010135 is a deficient number, since it is larger than the sum of its proper divisors (4229002033).

21145010135 is an equidigital number, since it uses as much as digits as its factorization.

21145010135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4229002032.

The product of its (nonzero) digits is 600, while the sum is 23.

Adding to 21145010135 its reverse (53101054112), we get a palindrome (74246064247).

The spelling of 21145010135 in words is "twenty-one billion, one hundred forty-five million, ten thousand, one hundred thirty-five".