21529036994 has 8 divisors (see below), whose sum is σ = 33407126460. Its totient is φ = 10393328176.

The previous prime is 21529036987. The next prime is 21529037017. The reversal of 21529036994 is 49963092512.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18510963025 + 3018073969 = 136055^2 + 54937^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 185595089 + ... + 185595204.

Almost surely, 2^21529036994 is an apocalyptic number.

21529036994 is a deficient number, since it is larger than the sum of its proper divisors (11878089466).

21529036994 is a wasteful number, since it uses less digits than its factorization.

21529036994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371190324.

The product of its (nonzero) digits is 1049760, while the sum is 50.

The spelling of 21529036994 in words is "twenty-one billion, five hundred twenty-nine million, thirty-six thousand, nine hundred ninety-four".