21420058849 has 4 divisors (see below), whose sum is σ = 24480067264. Its totient is φ = 18360050436.

The previous prime is 21420058843. The next prime is 21420058867. The reversal of 21420058849 is 94885002412.

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 not a de Polignac number, because 21420058849 - 2³ = 21420058841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21420058841) 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, 1530004197 + ... + 1530004210.

It is an arithmetic number, because the mean of its divisors is an integer number (6120016816).

Almost surely, 2^21420058849 is an apocalyptic number.

It is an amenable number.

21420058849 is a deficient number, since it is larger than the sum of its proper divisors (3060008415).

21420058849 is an equidigital number, since it uses as much as digits as its factorization.

21420058849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3060008414.

The product of its (nonzero) digits is 184320, while the sum is 43.

The spelling of 21420058849 in words is "twenty-one billion, four hundred twenty million, fifty-eight thousand, eight hundred forty-nine".