21212000983 has 4 divisors (see below), whose sum is σ = 21212808120. Its totient is φ = 21211193848.

The previous prime is 21212000977. The next prime is 21212000987. The reversal of 21212000983 is 38900021212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21212000983 - 2²⁵ = 21178446551 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 (21212000987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 362773 + ... + 417166.

It is an arithmetic number, because the mean of its divisors is an integer number (5303202030).

Almost surely, 2^21212000983 is an apocalyptic number.

21212000983 is a deficient number, since it is larger than the sum of its proper divisors (807137).

21212000983 is an equidigital number, since it uses as much as digits as its factorization.

21212000983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807136.

The product of its (nonzero) digits is 1728, while the sum is 28.

The spelling of 21212000983 in words is "twenty-one billion, two hundred twelve million, nine hundred eighty-three", and thus it is an aban number.