21868135349 has 8 divisors (see below), whose sum is σ = 21968494080. Its totient is φ = 21767931216.

The previous prime is 21868135337. The next prime is 21868135363. The reversal of 21868135349 is 94353186812.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21868135349 - 2¹² = 21868131253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21868135297 and 21868135306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21868135309) 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, 249812 + ... + 325794.

It is an arithmetic number, because the mean of its divisors is an integer number (2746061760).

Almost surely, 2^21868135349 is an apocalyptic number.

It is an amenable number.

21868135349 is a deficient number, since it is larger than the sum of its proper divisors (100358731).

21868135349 is a wasteful number, since it uses less digits than its factorization.

21868135349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77299.

The product of its digits is 1244160, while the sum is 50.

The spelling of 21868135349 in words is "twenty-one billion, eight hundred sixty-eight million, one hundred thirty-five thousand, three hundred forty-nine".