21891419812 has 24 divisors (see below), whose sum is σ = 38483720352. Its totient is φ = 10896120000.

The previous prime is 21891419789. The next prime is 21891419887.

21891419812 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×21891419812² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2247112 + ... + 2256832.

It is an arithmetic number, because the mean of its divisors is an integer number (1603488348).

Almost surely, 2^21891419812 is an apocalyptic number.

It is an amenable number.

21891419812 is a deficient number, since it is larger than the sum of its proper divisors (16592300540).

21891419812 is a wasteful number, since it uses less digits than its factorization.

21891419812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12219 (or 12217 counting only the distinct ones).

The product of its digits is 82944, while the sum is 46.

The spelling of 21891419812 in words is "twenty-one billion, eight hundred ninety-one million, four hundred nineteen thousand, eight hundred twelve".