21312115010135 has 4 divisors (see below), whose sum is σ = 25574538012168. Its totient is φ = 17049692008104.

The previous prime is 21312115010089. The next prime is 21312115010149. The reversal of 21312115010135 is 53101051121312.

It is a happy number.

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 21312115010135 - 2⁸ = 21312115009879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2131211501009 + ... + 2131211501018.

It is an arithmetic number, because the mean of its divisors is an integer number (6393634503042).

Almost surely, 2^{21312115010135} is an apocalyptic number.

21312115010135 is a deficient number, since it is larger than the sum of its proper divisors (4262423002033).

21312115010135 is an equidigital number, since it uses as much as digits as its factorization.

21312115010135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4262423002032.

The product of its (nonzero) digits is 900, while the sum is 26.

Adding to 21312115010135 its reverse (53101051121312), we get a palindrome (74413166131447).

The spelling of 21312115010135 in words is "twenty-one trillion, three hundred twelve billion, one hundred fifteen million, ten thousand, one hundred thirty-five".