26550021 has 4 divisors (see below), whose sum is σ = 35400032. Its totient is φ = 17700012.

The previous prime is 26549987. The next prime is 26550037. The reversal of 26550021 is 12005562.

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 26550021 - 2¹³ = 26541829 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 26550021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26550071) 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, 4425001 + ... + 4425006.

It is an arithmetic number, because the mean of its divisors is an integer number (8850008).

Almost surely, 2^26550021 is an apocalyptic number.

It is an amenable number.

26550021 is a deficient number, since it is larger than the sum of its proper divisors (8850011).

26550021 is an equidigital number, since it uses as much as digits as its factorization.

26550021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8850010.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 26550021 is about 5152.6712489737. The cubic root of 26550021 is about 298.3240660299.

Adding to 26550021 its reverse (12005562), we get a palindrome (38555583).

The spelling of 26550021 in words is "twenty-six million, five hundred fifty thousand, twenty-one".