26221139 has 4 divisors (see below), whose sum is σ = 29967024. Its totient is φ = 22475256.

The previous prime is 26221109. The next prime is 26221141. The reversal of 26221139 is 93112262.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93112262 = 2 ⋅46556131.

It is a cyclic number.

It is not a de Polignac number, because 26221139 - 2¹⁶ = 26155603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26221109) 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, 1872932 + ... + 1872945.

It is an arithmetic number, because the mean of its divisors is an integer number (7491756).

Almost surely, 2^26221139 is an apocalyptic number.

26221139 is a deficient number, since it is larger than the sum of its proper divisors (3745885).

26221139 is an equidigital number, since it uses as much as digits as its factorization.

26221139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3745884.

The product of its digits is 1296, while the sum is 26.

The square root of 26221139 is about 5120.6580631790. The cubic root of 26221139 is about 297.0871386285.

The spelling of 26221139 in words is "twenty-six million, two hundred twenty-one thousand, one hundred thirty-nine".