21083261782 has 32 divisors (see below), whose sum is σ = 35476289280. Its totient is φ = 9312720480.

The previous prime is 21083261767. The next prime is 21083261813. The reversal of 21083261782 is 28716238012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 657519 + ... + 688837.

It is an arithmetic number, because the mean of its divisors is an integer number (1108634040).

Almost surely, 2^21083261782 is an apocalyptic number.

21083261782 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21083261782 is a deficient number, since it is larger than the sum of its proper divisors (14393027498).

21083261782 is a wasteful number, since it uses less digits than its factorization.

21083261782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32196.

The product of its (nonzero) digits is 64512, while the sum is 40.

Adding to 21083261782 its reverse (28716238012), we get a palindrome (49799499794).

The spelling of 21083261782 in words is "twenty-one billion, eighty-three million, two hundred sixty-one thousand, seven hundred eighty-two".