20213135015 has 4 divisors (see below), whose sum is σ = 24255762024. Its totient is φ = 16170508008.

The previous prime is 20213134993. The next prime is 20213135017. The reversal of 20213135015 is 51053131202.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20213135015 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 (20213135017) 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, 2021313497 + ... + 2021313506.

It is an arithmetic number, because the mean of its divisors is an integer number (6063940506).

Almost surely, 2^20213135015 is an apocalyptic number.

20213135015 is a deficient number, since it is larger than the sum of its proper divisors (4042627009).

20213135015 is an equidigital number, since it uses as much as digits as its factorization.

20213135015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4042627008.

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

Adding to 20213135015 its reverse (51053131202), we get a palindrome (71266266217).

The spelling of 20213135015 in words is "twenty billion, two hundred thirteen million, one hundred thirty-five thousand, fifteen".