26651921 has 2 divisors, whose sum is σ = 26651922. Its totient is φ = 26651920.

The previous prime is 26651879. The next prime is 26651923. The reversal of 26651921 is 12915662.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14714896 + 11937025 = 3836^2 + 3455^2 .

It is a cyclic number.

It is not a de Polignac number, because 26651921 - 2¹⁴ = 26635537 is a prime.

It is a Sophie Germain prime.

Together with 26651923, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (26651923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13325960 + 13325961.

It is an arithmetic number, because the mean of its divisors is an integer number (13325961).

Almost surely, 2^26651921 is an apocalyptic number.

It is an amenable number.

26651921 is a deficient number, since it is larger than the sum of its proper divisors (1).

26651921 is an equidigital number, since it uses as much as digits as its factorization.

26651921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 32.

The square root of 26651921 is about 5162.5498544808. The cubic root of 26651921 is about 298.7052385334.

It can be divided in two parts, 26651 and 921, that added together give a palindrome (27572).

The spelling of 26651921 in words is "twenty-six million, six hundred fifty-one thousand, nine hundred twenty-one".