26196772221 has 24 divisors (see below), whose sum is σ = 39288893280. Its totient is φ = 17443313712.

The previous prime is 26196772211. The next prime is 26196772271. The reversal of 26196772221 is 12227769162.

26196772221 is a `hidden beast` number, since 2 + 619 + 6 + 7 + 7 + 2 + 2 + 21 = 666.

It is not a de Polignac number, because 26196772221 - 2²¹ = 26194675069 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26196772201) 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, 136426 + ... + 266468.

It is an arithmetic number, because the mean of its divisors is an integer number (1637037220).

Almost surely, 2^26196772221 is an apocalyptic number.

It is an amenable number.

26196772221 is a deficient number, since it is larger than the sum of its proper divisors (13092121059).

26196772221 is an equidigital number, since it uses as much as digits as its factorization.

26196772221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130887 (or 130875 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The spelling of 26196772221 in words is "twenty-six billion, one hundred ninety-six million, seven hundred seventy-two thousand, two hundred twenty-one".