21363373491 has 8 divisors (see below), whose sum is σ = 28592805120. Its totient is φ = 14188095432.

The previous prime is 21363373399. The next prime is 21363373513. The reversal of 21363373491 is 19437336312.

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

It is not a de Polignac number, because 21363373491 - 2¹⁴ = 21363357107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21363374491) 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, 13537471 + ... + 13539048.

It is an arithmetic number, because the mean of its divisors is an integer number (3574100640).

Almost surely, 2^21363373491 is an apocalyptic number.

21363373491 is a deficient number, since it is larger than the sum of its proper divisors (7229431629).

21363373491 is a wasteful number, since it uses less digits than its factorization.

21363373491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27076785.

The product of its digits is 244944, while the sum is 42.

The spelling of 21363373491 in words is "twenty-one billion, three hundred sixty-three million, three hundred seventy-three thousand, four hundred ninety-one".