21313352485 has 4 divisors (see below), whose sum is σ = 25576022988. Its totient is φ = 17050681984.

The previous prime is 21313352453. The next prime is 21313352491. The reversal of 21313352485 is 58425331312.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6046773121 + 15266579364 = 77761^2 + 123558^2 .

It is a cyclic number.

It is not a de Polignac number, because 21313352485 - 2⁵ = 21313352453 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, 2131335244 + ... + 2131335253.

It is an arithmetic number, because the mean of its divisors is an integer number (6394005747).

Almost surely, 2^21313352485 is an apocalyptic number.

It is an amenable number.

21313352485 is a deficient number, since it is larger than the sum of its proper divisors (4262670503).

21313352485 is an equidigital number, since it uses as much as digits as its factorization.

21313352485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4262670502.

The product of its digits is 86400, while the sum is 37.

Adding to 21313352485 its reverse (58425331312), we get a palindrome (79738683797).

The spelling of 21313352485 in words is "twenty-one billion, three hundred thirteen million, three hundred fifty-two thousand, four hundred eighty-five".