21673297019 has 8 divisors (see below), whose sum is σ = 23665241712. Its totient is φ = 19684959840.

The previous prime is 21673297007. The next prime is 21673297073. The reversal of 21673297019 is 91079237612.

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 21673297019 - 2⁸ = 21673296763 is a prime.

It is a super-2 number, since 2×21673297019² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21673297319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 889304 + ... + 913349.

It is an arithmetic number, because the mean of its divisors is an integer number (2958155214).

Almost surely, 2^21673297019 is an apocalyptic number.

21673297019 is a deficient number, since it is larger than the sum of its proper divisors (1991944693).

21673297019 is a wasteful number, since it uses less digits than its factorization.

21673297019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1803757.

The product of its (nonzero) digits is 285768, while the sum is 47.

The spelling of 21673297019 in words is "twenty-one billion, six hundred seventy-three million, two hundred ninety-seven thousand, nineteen".