21024347349 has 4 divisors (see below), whose sum is σ = 28032463136. Its totient is φ = 14016231564.

The previous prime is 21024347339. The next prime is 21024347359. The reversal of 21024347349 is 94374342012.

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 an interprime number because it is at equal distance from previous prime (21024347339) and next prime (21024347359).

It is not a de Polignac number, because 21024347349 - 2⁵ = 21024347317 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 (21024347329) 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, 3504057889 + ... + 3504057894.

It is an arithmetic number, because the mean of its divisors is an integer number (7008115784).

Almost surely, 2^21024347349 is an apocalyptic number.

It is an amenable number.

21024347349 is a deficient number, since it is larger than the sum of its proper divisors (7008115787).

21024347349 is an equidigital number, since it uses as much as digits as its factorization.

21024347349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7008115786.

The product of its (nonzero) digits is 145152, while the sum is 39.

The spelling of 21024347349 in words is "twenty-one billion, twenty-four million, three hundred forty-seven thousand, three hundred forty-nine".