21141842909 has 4 divisors (see below), whose sum is σ = 23063828640. Its totient is φ = 19219857180.

The previous prime is 21141842899. The next prime is 21141842927. The reversal of 21141842909 is 90924814112.

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 21141842909 - 2⁴ = 21141842893 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 (21141842999) 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, 960992849 + ... + 960992870.

It is an arithmetic number, because the mean of its divisors is an integer number (5765957160).

Almost surely, 2^21141842909 is an apocalyptic number.

It is an amenable number.

21141842909 is a deficient number, since it is larger than the sum of its proper divisors (1921985731).

21141842909 is a wasteful number, since it uses less digits than its factorization.

21141842909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1921985730.

The product of its (nonzero) digits is 41472, while the sum is 41.

The spelling of 21141842909 in words is "twenty-one billion, one hundred forty-one million, eight hundred forty-two thousand, nine hundred nine".