21916173494 has 8 divisors (see below), whose sum is σ = 33165183240. Its totient is φ = 10861112416.

The previous prime is 21916173463. The next prime is 21916173533. The reversal of 21916173494 is 49437161912.

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

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, 48486884 + ... + 48487335.

It is an arithmetic number, because the mean of its divisors is an integer number (4145647905).

Almost surely, 2^21916173494 is an apocalyptic number.

21916173494 is a deficient number, since it is larger than the sum of its proper divisors (11249009746).

21916173494 is a wasteful number, since it uses less digits than its factorization.

21916173494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96974334.

The product of its digits is 326592, while the sum is 47.

The spelling of 21916173494 in words is "twenty-one billion, nine hundred sixteen million, one hundred seventy-three thousand, four hundred ninety-four".