21048029643 has 4 divisors (see below), whose sum is σ = 28064039528. Its totient is φ = 14032019760.

The previous prime is 21048029621. The next prime is 21048029663. The reversal of 21048029643 is 34692084012.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21048029643 - 2⁹ = 21048029131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21048029663) 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, 3508004938 + ... + 3508004943.

It is an arithmetic number, because the mean of its divisors is an integer number (7016009882).

Almost surely, 2^21048029643 is an apocalyptic number.

21048029643 is a deficient number, since it is larger than the sum of its proper divisors (7016009885).

21048029643 is an equidigital number, since it uses as much as digits as its factorization.

21048029643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7016009884.

The product of its (nonzero) digits is 82944, while the sum is 39.

The spelling of 21048029643 in words is "twenty-one billion, forty-eight million, twenty-nine thousand, six hundred forty-three".