21275471943 has 12 divisors (see below), whose sum is σ = 33524986248. Its totient is φ = 12894225360.

The previous prime is 21275471897. The next prime is 21275471963. The reversal of 21275471943 is 34917457212.

21275471943 is a `hidden beast` number, since 2 + 12 + 7 + 547 + 1 + 94 + 3 = 666.

It is not a de Polignac number, because 21275471943 - 2⁶ = 21275471879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21275471963) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 107451780 + ... + 107451977.

It is an arithmetic number, because the mean of its divisors is an integer number (2793748854).

Almost surely, 2^21275471943 is an apocalyptic number.

21275471943 is a deficient number, since it is larger than the sum of its proper divisors (12249514305).

21275471943 is a wasteful number, since it uses less digits than its factorization.

21275471943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214903774 (or 214903771 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The spelling of 21275471943 in words is "twenty-one billion, two hundred seventy-five million, four hundred seventy-one thousand, nine hundred forty-three".