21011220983 has 2 divisors, whose sum is σ = 21011220984. Its totient is φ = 21011220982.

The previous prime is 21011220977. The next prime is 21011221019. The reversal of 21011220983 is 38902211012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21011220983 - 2²⁸ = 20742785527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21011220953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505610491 + 10505610492.

It is an arithmetic number, because the mean of its divisors is an integer number (10505610492).

Almost surely, 2^21011220983 is an apocalyptic number.

21011220983 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011220983 is an equidigital number, since it uses as much as digits as its factorization.

21011220983 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 29.

Adding to 21011220983 its reverse (38902211012), we get a palindrome (59913431995).

The spelling of 21011220983 in words is "twenty-one billion, eleven million, two hundred twenty thousand, nine hundred eighty-three".