21814347491 has 8 divisors (see below), whose sum is σ = 23046707520. Its totient is φ = 20613996928.

The previous prime is 21814347449. The next prime is 21814347523. The reversal of 21814347491 is 19474341812.

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 21814347491 - 2¹⁴ = 21814331107 is a prime.

It is a super-3 number, since 3×21814347491³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21814347791) 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, 8000966 + ... + 8003691.

It is an arithmetic number, because the mean of its divisors is an integer number (2880838440).

Almost surely, 2^21814347491 is an apocalyptic number.

21814347491 is a deficient number, since it is larger than the sum of its proper divisors (1232360029).

21814347491 is a wasteful number, since it uses less digits than its factorization.

21814347491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16004733.

The product of its digits is 193536, while the sum is 44.

The spelling of 21814347491 in words is "twenty-one billion, eight hundred fourteen million, three hundred forty-seven thousand, four hundred ninety-one".