21048331 has 4 divisors (see below), whose sum is σ = 21108312. Its totient is φ = 20988352.

The previous prime is 21048323. The next prime is 21048341. The reversal of 21048331 is 13384012.

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

It is a cyclic number.

It is not a de Polignac number, because 21048331 - 2³ = 21048323 is a prime.

It is a super-2 number, since 2×21048331² = 886064475771122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21048341) 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, 29461 + ... + 30166.

It is an arithmetic number, because the mean of its divisors is an integer number (5277078).

Almost surely, 2^21048331 is an apocalyptic number.

21048331 is a deficient number, since it is larger than the sum of its proper divisors (59981).

21048331 is an equidigital number, since it uses as much as digits as its factorization.

21048331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59980.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 21048331 is about 4587.8460087496. The cubic root of 21048331 is about 276.1039087505.

The spelling of 21048331 in words is "twenty-one million, forty-eight thousand, three hundred thirty-one".