26157921 has 4 divisors (see below), whose sum is σ = 34877232. Its totient is φ = 17438612.

The previous prime is 26157907. The next prime is 26157961. The reversal of 26157921 is 12975162.

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 a cyclic number.

It is not a de Polignac number, because 26157921 - 2⁷ = 26157793 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (26157961) 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, 4359651 + ... + 4359656.

It is an arithmetic number, because the mean of its divisors is an integer number (8719308).

Almost surely, 2^26157921 is an apocalyptic number.

It is an amenable number.

26157921 is a deficient number, since it is larger than the sum of its proper divisors (8719311).

26157921 is an equidigital number, since it uses as much as digits as its factorization.

26157921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8719310.

The product of its digits is 7560, while the sum is 33.

The square root of 26157921 is about 5114.4814986468. The cubic root of 26157921 is about 296.8481918692.

The spelling of 26157921 in words is "twenty-six million, one hundred fifty-seven thousand, nine hundred twenty-one".