21898089812 has 12 divisors (see below), whose sum is σ = 38490476640. Its totient is φ = 10900810776.

The previous prime is 21898089799. The next prime is 21898089839.

21898089812 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12057512 + ... + 12059327.

It is an arithmetic number, because the mean of its divisors is an integer number (3207539720).

Almost surely, 2^21898089812 is an apocalyptic number.

It is an amenable number.

21898089812 is a deficient number, since it is larger than the sum of its proper divisors (16592386828).

21898089812 is a wasteful number, since it uses less digits than its factorization.

21898089812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24117070 (or 24117068 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 56.

The spelling of 21898089812 in words is "twenty-one billion, eight hundred ninety-eight million, eighty-nine thousand, eight hundred twelve".