21899123371851 has 8 divisors (see below), whose sum is σ = 31853270359104. Its totient is φ = 13272195982920.

The previous prime is 21899123371847. The next prime is 21899123371889. The reversal of 21899123371851 is 15817332199812.

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

It is not a de Polignac number, because 21899123371851 - 2² = 21899123371847 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21899123371841) 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, 331804899541 + ... + 331804899606.

It is an arithmetic number, because the mean of its divisors is an integer number (3981658794888).

Almost surely, 2^{21899123371851} is an apocalyptic number.

21899123371851 is a deficient number, since it is larger than the sum of its proper divisors (9954146987253).

21899123371851 is a wasteful number, since it uses less digits than its factorization.

21899123371851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663609799161.

The product of its digits is 6531840, while the sum is 60.

The spelling of 21899123371851 in words is "twenty-one trillion, eight hundred ninety-nine billion, one hundred twenty-three million, three hundred seventy-one thousand, eight hundred fifty-one".