21038439074 has 4 divisors (see below), whose sum is σ = 31557658614. Its totient is φ = 10519219536.

The previous prime is 21038439031. The next prime is 21038439091. The reversal of 21038439074 is 47093483012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18207454225 + 2830984849 = 134935^2 + 53207^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5259609767 + ... + 5259609770.

Almost surely, 2^21038439074 is an apocalyptic number.

21038439074 is a deficient number, since it is larger than the sum of its proper divisors (10519219540).

21038439074 is a wasteful number, since it uses less digits than its factorization.

21038439074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10519219539.

The product of its (nonzero) digits is 145152, while the sum is 41.

The spelling of 21038439074 in words is "twenty-one billion, thirty-eight million, four hundred thirty-nine thousand, seventy-four".