21899173531 has 8 divisors (see below), whose sum is σ = 22050504000. Its totient is φ = 21747901440.

The previous prime is 21899173519. The next prime is 21899173537. The reversal of 21899173531 is 13537199812.

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 21899173531 - 2¹³ = 21899165339 is a prime.

It is a super-2 number, since 2×21899173531² (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 (21899173537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 961566 + ... + 984076.

It is an arithmetic number, because the mean of its divisors is an integer number (2756313000).

Almost surely, 2^21899173531 is an apocalyptic number.

21899173531 is a deficient number, since it is larger than the sum of its proper divisors (151330469).

21899173531 is a wasteful number, since it uses less digits than its factorization.

21899173531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29189.

The product of its digits is 408240, while the sum is 49.

The spelling of 21899173531 in words is "twenty-one billion, eight hundred ninety-nine million, one hundred seventy-three thousand, five hundred thirty-one".