21382805492 has 6 divisors (see below), whose sum is σ = 37419909618. Its totient is φ = 10691402744.

The previous prime is 21382805491. The next prime is 21382805519. The reversal of 21382805492 is 29450828312.

It can be written as a sum of positive squares in only one way, i.e., 12697683856 + 8685121636 = 112684^2 + 93194^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21382805491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2672850683 + ... + 2672850690.

It is an arithmetic number, because the mean of its divisors is an integer number (6236651603).

Almost surely, 2^21382805492 is an apocalyptic number.

It is an amenable number.

21382805492 is a deficient number, since it is larger than the sum of its proper divisors (16037104126).

21382805492 is a wasteful number, since it uses less digits than its factorization.

21382805492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5345701377 (or 5345701375 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 44.

The spelling of 21382805492 in words is "twenty-one billion, three hundred eighty-two million, eight hundred five thousand, four hundred ninety-two".