21201209983 has 16 divisors (see below), whose sum is σ = 23717772000. Its totient is φ = 18833513472.

The previous prime is 21201209963. The next prime is 21201209993. The reversal of 21201209983 is 38990210212.

It is a cyclic number.

It is not a de Polignac number, because 21201209983 - 2¹⁷ = 21201078911 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 (21201209933) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35118 + ... + 208891.

It is an arithmetic number, because the mean of its divisors is an integer number (1482360750).

Almost surely, 2^21201209983 is an apocalyptic number.

21201209983 is a deficient number, since it is larger than the sum of its proper divisors (2516562017).

21201209983 is a wasteful number, since it uses less digits than its factorization.

21201209983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244314.

The product of its (nonzero) digits is 15552, while the sum is 37.

The spelling of 21201209983 in words is "twenty-one billion, two hundred one million, two hundred nine thousand, nine hundred eighty-three".