21891286330 has 16 divisors (see below), whose sum is σ = 39411544320. Its totient is φ = 8754908112.

The previous prime is 21891286321. The next prime is 21891286363. The reversal of 21891286330 is 3368219812.

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, 142770 + ... + 253309.

It is an arithmetic number, because the mean of its divisors is an integer number (2463221520).

Almost surely, 2^21891286330 is an apocalyptic number.

21891286330 is a deficient number, since it is larger than the sum of its proper divisors (17520257990).

21891286330 is a wasteful number, since it uses less digits than its factorization.

21891286330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401613.

The product of its (nonzero) digits is 124416, while the sum is 43.

The spelling of 21891286330 in words is "twenty-one billion, eight hundred ninety-one million, two hundred eighty-six thousand, three hundred thirty".