21443420132 has 6 divisors (see below), whose sum is σ = 37525985238. Its totient is φ = 10721710064.

The previous prime is 21443420129. The next prime is 21443420147. The reversal of 21443420132 is 23102434412.

It can be written as a sum of positive squares in only one way, i.e., 19406161636 + 2037258496 = 139306^2 + 45136^2 .

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, 2680427513 + ... + 2680427520.

It is an arithmetic number, because the mean of its divisors is an integer number (6254330873).

Almost surely, 2^21443420132 is an apocalyptic number.

It is an amenable number.

21443420132 is a deficient number, since it is larger than the sum of its proper divisors (16082565106).

21443420132 is a wasteful number, since it uses less digits than its factorization.

21443420132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5360855037 (or 5360855035 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21443420132 its reverse (23102434412), we get a palindrome (44545854544).

The spelling of 21443420132 in words is "twenty-one billion, four hundred forty-three million, four hundred twenty thousand, one hundred thirty-two".