21231102513 has 8 divisors (see below), whose sum is σ = 28567844800. Its totient is φ = 14024214288.

The previous prime is 21231102481. The next prime is 21231102539. The reversal of 21231102513 is 31520113212.

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

It is not a de Polignac number, because 21231102513 - 2⁵ = 21231102481 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 21231102513.

It is not an unprimeable number, because it can be changed into a prime (21231102713) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32463133 + ... + 32463786.

It is an arithmetic number, because the mean of its divisors is an integer number (3570980600).

Almost surely, 2^21231102513 is an apocalyptic number.

It is an amenable number.

21231102513 is a deficient number, since it is larger than the sum of its proper divisors (7336742287).

21231102513 is a wasteful number, since it uses less digits than its factorization.

21231102513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64927031.

The product of its (nonzero) digits is 360, while the sum is 21.

Adding to 21231102513 its reverse (31520113212), we get a palindrome (52751215725).

The spelling of 21231102513 in words is "twenty-one billion, two hundred thirty-one million, one hundred two thousand, five hundred thirteen".