21416035973 has 4 divisors (see below), whose sum is σ = 21495062208. Its totient is φ = 21337009740.

The previous prime is 21416035967. The next prime is 21416035987. The reversal of 21416035973 is 37953061412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21416035973 - 2¹⁰ = 21416034949 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21416035973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21416035673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39512711 + ... + 39513252.

It is an arithmetic number, because the mean of its divisors is an integer number (5373765552).

Almost surely, 2^21416035973 is an apocalyptic number.

It is an amenable number.

21416035973 is a deficient number, since it is larger than the sum of its proper divisors (79026235).

21416035973 is an equidigital number, since it uses as much as digits as its factorization.

21416035973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79026234.

The product of its (nonzero) digits is 136080, while the sum is 41.

The spelling of 21416035973 in words is "twenty-one billion, four hundred sixteen million, thirty-five thousand, nine hundred seventy-three".