26247221 has 24 divisors (see below), whose sum is σ = 35452224. Its totient is φ = 18869760.

The previous prime is 26247211. The next prime is 26247229. The reversal of 26247221 is 12274262.

It is a de Polignac number, because none of the positive numbers 2^k-26247221 is a prime.

It is a super-2 number, since 2×26247221² = 1377833220445682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26247229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12005 + ... + 14021.

It is an arithmetic number, because the mean of its divisors is an integer number (1477176).

Almost surely, 2^26247221 is an apocalyptic number.

It is an amenable number.

26247221 is a deficient number, since it is larger than the sum of its proper divisors (9205003).

26247221 is a wasteful number, since it uses less digits than its factorization.

26247221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2061 (or 2048 counting only the distinct ones).

The product of its digits is 2688, while the sum is 26.

The square root of 26247221 is about 5123.2041731713. The cubic root of 26247221 is about 297.1856095480.

The spelling of 26247221 in words is "twenty-six million, two hundred forty-seven thousand, two hundred twenty-one".