21694019043 has 32 divisors (see below), whose sum is σ = 30185833216. Its totient is φ = 13845541248.

The previous prime is 21694019027. The next prime is 21694019051. The reversal of 21694019043 is 34091049612.

It is not a de Polignac number, because 21694019043 - 2⁴ = 21694019027 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21694018992 and 21694019010.

It is not an unprimeable number, because it can be changed into a prime (21694019003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12589980 + ... + 12591702.

It is an arithmetic number, because the mean of its divisors is an integer number (943307288).

Almost surely, 2^21694019043 is an apocalyptic number.

21694019043 is a deficient number, since it is larger than the sum of its proper divisors (8491814173).

21694019043 is a wasteful number, since it uses less digits than its factorization.

21694019043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3523.

The product of its (nonzero) digits is 46656, while the sum is 39.

The spelling of 21694019043 in words is "twenty-one billion, six hundred ninety-four million, nineteen thousand, forty-three".