21106784941 has 4 divisors (see below), whose sum is σ = 23025583584. Its totient is φ = 19187986300.

The previous prime is 21106784929. The next prime is 21106784977. The reversal of 21106784941 is 14948760112.

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 21106784941 - 2¹³ = 21106776749 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 (21106784981) 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, 959399305 + ... + 959399326.

It is an arithmetic number, because the mean of its divisors is an integer number (5756395896).

Almost surely, 2^21106784941 is an apocalyptic number.

It is an amenable number.

21106784941 is a deficient number, since it is larger than the sum of its proper divisors (1918798643).

21106784941 is a wasteful number, since it uses less digits than its factorization.

21106784941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1918798642.

The product of its (nonzero) digits is 96768, while the sum is 43.

The spelling of 21106784941 in words is "twenty-one billion, one hundred six million, seven hundred eighty-four thousand, nine hundred forty-one".