21212019983 has 24 divisors (see below), whose sum is σ = 27156701520. Its totient is φ = 16382526720.

The previous prime is 21212019953. The next prime is 21212020001. The reversal of 21212019983 is 38991021212.

It is not a de Polignac number, because 21212019983 - 2²⁸ = 20943584527 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 (21212019953) 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 23 ways as a sum of consecutive naturals, for example, 113228 + ... + 235041.

It is an arithmetic number, because the mean of its divisors is an integer number (1131529230).

Almost surely, 2^21212019983 is an apocalyptic number.

21212019983 is a deficient number, since it is larger than the sum of its proper divisors (5944681537).

21212019983 is a wasteful number, since it uses less digits than its factorization.

21212019983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348407 (or 348400 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 38.

The spelling of 21212019983 in words is "twenty-one billion, two hundred twelve million, nineteen thousand, nine hundred eighty-three".