21021120983 has 6 divisors (see below), whose sum is σ = 21057338256. Its totient is φ = 20984965892.

The previous prime is 21021120941. The next prime is 21021121007. The reversal of 21021120983 is 38902112012.

It is not a de Polignac number, because 21021120983 - 2¹⁸ = 21020858839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021120083) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 314066 + ... + 375072.

It is an arithmetic number, because the mean of its divisors is an integer number (3509556376).

Almost surely, 2^21021120983 is an apocalyptic number.

21021120983 is a deficient number, since it is larger than the sum of its proper divisors (36217273).

21021120983 is an frugal number, since it uses more digits than its factorization.

21021120983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62181 (or 61594 counting only the distinct ones).

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

Adding to 21021120983 its reverse (38902112012), we get a palindrome (59923232995).

The spelling of 21021120983 in words is "twenty-one billion, twenty-one million, one hundred twenty thousand, nine hundred eighty-three".