21447473796 has 36 divisors (see below), whose sum is σ = 61959369472. Its totient is φ = 6127849584.

The previous prime is 21447473767. The next prime is 21447473833. The reversal of 21447473796 is 69737474412.

It is a happy number.

21447473796 is a `hidden beast` number, since 2 + 14 + 474 + 73 + 7 + 96 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42554260 + ... + 42554763.

Almost surely, 2^21447473796 is an apocalyptic number.

It is an amenable number.

21447473796 is an abundant number, since it is smaller than the sum of its proper divisors (40511895676).

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

21447473796 is a wasteful number, since it uses less digits than its factorization.

21447473796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85109040 (or 85109035 counting only the distinct ones).

The product of its digits is 7112448, while the sum is 54.

The spelling of 21447473796 in words is "twenty-one billion, four hundred forty-seven million, four hundred seventy-three thousand, seven hundred ninety-six".