21275471939 has 8 divisors (see below), whose sum is σ = 22493034000. Its totient is φ = 20067689952.

The previous prime is 21275471897. The next prime is 21275471963. The reversal of 21275471939 is 93917457212.

It is a happy number.

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

It is not a de Polignac number, because 21275471939 - 2⁸ = 21275471683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21275471989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2440544 + ... + 2449245.

It is an arithmetic number, because the mean of its divisors is an integer number (2811629250).

Almost surely, 2^21275471939 is an apocalyptic number.

21275471939 is a deficient number, since it is larger than the sum of its proper divisors (1217562061).

21275471939 is a wasteful number, since it uses less digits than its factorization.

21275471939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4890037.

The product of its digits is 952560, while the sum is 50.

The spelling of 21275471939 in words is "twenty-one billion, two hundred seventy-five million, four hundred seventy-one thousand, nine hundred thirty-nine".