21213131083 has 2 divisors, whose sum is σ = 21213131084. Its totient is φ = 21213131082.

The previous prime is 21213131057. The next prime is 21213131123. The reversal of 21213131083 is 38013131212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21213131083 - 2⁹ = 21213130571 is a prime.

It is not a weakly prime, because it can be changed into another prime (21213131383) by changing a digit.

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, 10606565541 + 10606565542.

It is an arithmetic number, because the mean of its divisors is an integer number (10606565542).

Almost surely, 2^21213131083 is an apocalyptic number.

21213131083 is a deficient number, since it is larger than the sum of its proper divisors (1).

21213131083 is an equidigital number, since it uses as much as digits as its factorization.

21213131083 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

Adding to 21213131083 its reverse (38013131212), we get a palindrome (59226262295).

The spelling of 21213131083 in words is "twenty-one billion, two hundred thirteen million, one hundred thirty-one thousand, eighty-three".