21881347732 has 6 divisors (see below), whose sum is σ = 38292358538. Its totient is φ = 10940673864.

The previous prime is 21881347729. The next prime is 21881347793. The reversal of 21881347732 is 23774318812.

It can be written as a sum of positive squares in only one way, i.e., 21775134096 + 106213636 = 147564^2 + 10306^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2735168463 + ... + 2735168470.

Almost surely, 2^21881347732 is an apocalyptic number.

It is an amenable number.

21881347732 is a deficient number, since it is larger than the sum of its proper divisors (16411010806).

21881347732 is a wasteful number, since it uses less digits than its factorization.

21881347732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5470336937 (or 5470336935 counting only the distinct ones).

The product of its digits is 451584, while the sum is 46.

The spelling of 21881347732 in words is "twenty-one billion, eight hundred eighty-one million, three hundred forty-seven thousand, seven hundred thirty-two".