21112209973 has 8 divisors (see below), whose sum is σ = 21243414528. Its totient is φ = 20981062704.

The previous prime is 21112209949. The next prime is 21112209997. The reversal of 21112209973 is 37990221112.

It is an interprime number because it is at equal distance from previous prime (21112209949) and next prime (21112209997).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21112209973 - 2¹⁷ = 21112078901 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 (21112209913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 907515 + ... + 930487.

It is an arithmetic number, because the mean of its divisors is an integer number (2655426816).

Almost surely, 2^21112209973 is an apocalyptic number.

It is an amenable number.

21112209973 is a deficient number, since it is larger than the sum of its proper divisors (131204555).

21112209973 is a wasteful number, since it uses less digits than its factorization.

21112209973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28643.

The product of its (nonzero) digits is 13608, while the sum is 37.

The spelling of 21112209973 in words is "twenty-one billion, one hundred twelve million, two hundred nine thousand, nine hundred seventy-three".