21231361382 has 16 divisors (see below), whose sum is σ = 39705403392. Its totient is φ = 8271958920.

The previous prime is 21231361369. The next prime is 21231361427. The reversal of 21231361382 is 28316313212.

It is a super-2 number, since 2×21231361382² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68932838 + ... + 68933145.

It is an arithmetic number, because the mean of its divisors is an integer number (2481587712).

Almost surely, 2^21231361382 is an apocalyptic number.

21231361382 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21231361382 is a deficient number, since it is larger than the sum of its proper divisors (18474042010).

21231361382 is a wasteful number, since it uses less digits than its factorization.

21231361382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137866003.

The product of its digits is 10368, while the sum is 32.

Adding to 21231361382 its reverse (28316313212), we get a palindrome (49547674594).

The spelling of 21231361382 in words is "twenty-one billion, two hundred thirty-one million, three hundred sixty-one thousand, three hundred eighty-two".