21550793 has 16 divisors (see below), whose sum is σ = 24800256. Its totient is φ = 18535440.

The previous prime is 21550787. The next prime is 21550801. The reversal of 21550793 is 39705512.

It is not a de Polignac number, because 21550793 - 2⁴ = 21550777 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21550493) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25646 + ... + 26472.

It is an arithmetic number, because the mean of its divisors is an integer number (1550016).

Almost surely, 2^21550793 is an apocalyptic number.

21550793 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21550793 is a deficient number, since it is larger than the sum of its proper divisors (3249463).

21550793 is a wasteful number, since it uses less digits than its factorization.

21550793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964.

The product of its (nonzero) digits is 9450, while the sum is 32.

The square root of 21550793 is about 4642.2831667187. The cubic root of 21550793 is about 278.2836889797.

The spelling of 21550793 in words is "twenty-one million, five hundred fifty thousand, seven hundred ninety-three".