21994044146 has 8 divisors (see below), whose sum is σ = 32991878640. Its totient is φ = 10996751268.

The previous prime is 21994044143. The next prime is 21994044181. The reversal of 21994044146 is 64144049912.

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

It is a junction number, because it is equal to n+sod(n) for n = 21994044097 and 21994044106.

It is not an unprimeable number, because it can be changed into a prime (21994044143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11036 + ... + 210023.

It is an arithmetic number, because the mean of its divisors is an integer number (4123984830).

Almost surely, 2^21994044146 is an apocalyptic number.

21994044146 is a deficient number, since it is larger than the sum of its proper divisors (10997834494).

21994044146 is a wasteful number, since it uses less digits than its factorization.

21994044146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270808.

The product of its (nonzero) digits is 248832, while the sum is 44.

The spelling of 21994044146 in words is "twenty-one billion, nine hundred ninety-four million, forty-four thousand, one hundred forty-six".