21474453732 has 12 divisors (see below), whose sum is σ = 50107058736. Its totient is φ = 7158151240.

The previous prime is 21474453719. The next prime is 21474453739. The reversal of 21474453732 is 23735447412.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×21474453732² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21474453739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 894768894 + ... + 894768917.

It is an arithmetic number, because the mean of its divisors is an integer number (4175588228).

Almost surely, 2^21474453732 is an apocalyptic number.

It is an amenable number.

21474453732 is an abundant number, since it is smaller than the sum of its proper divisors (28632605004).

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

21474453732 is a wasteful number, since it uses less digits than its factorization.

21474453732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1789537818 (or 1789537816 counting only the distinct ones).

The product of its digits is 564480, while the sum is 42.

The spelling of 21474453732 in words is "twenty-one billion, four hundred seventy-four million, four hundred fifty-three thousand, seven hundred thirty-two".