21311585119309 has 4 divisors (see below), whose sum is σ = 22565207773404. Its totient is φ = 20057962465216.

The previous prime is 21311585119301. The next prime is 21311585119367. The reversal of 21311585119309 is 90391158511312.

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 16166808515209 + 5144776604100 = 4020797^2 + 2268210^2 .

It is a cyclic number.

It is not a de Polignac number, because 21311585119309 - 2³ = 21311585119301 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 (21311585119301) 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, 626811327022 + ... + 626811327055.

It is an arithmetic number, because the mean of its divisors is an integer number (5641301943351).

Almost surely, 2^{21311585119309} is an apocalyptic number.

It is an amenable number.

21311585119309 is a deficient number, since it is larger than the sum of its proper divisors (1253622654095).

21311585119309 is a wasteful number, since it uses less digits than its factorization.

21311585119309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1253622654094.

The product of its (nonzero) digits is 291600, while the sum is 49.

The spelling of 21311585119309 in words is "twenty-one trillion, three hundred eleven billion, five hundred eighty-five million, one hundred nineteen thousand, three hundred nine".