21491075094 has 16 divisors (see below), whose sum is σ = 43010957232. Its totient is φ = 7158890528.

The previous prime is 21491075071. The next prime is 21491075101. The reversal of 21491075094 is 49057019412.

It is a congruent number.

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, 1190589 + ... + 1208504.

It is an arithmetic number, because the mean of its divisors is an integer number (2688184827).

Almost surely, 2^21491075094 is an apocalyptic number.

21491075094 is an abundant number, since it is smaller than the sum of its proper divisors (21519882138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21491075094 is a wasteful number, since it uses less digits than its factorization.

21491075094 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2400591.

The product of its (nonzero) digits is 90720, while the sum is 42.

The spelling of 21491075094 in words is "twenty-one billion, four hundred ninety-one million, seventy-five thousand, ninety-four".