26366400221 has 8 divisors (see below), whose sum is σ = 31443160704. Its totient is φ = 21617172720.

The previous prime is 26366400217. The next prime is 26366400227. The reversal of 26366400221 is 12200466362.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 26366400221 - 2² = 26366400217 is a prime.

It is a super-2 number, since 2×26366400221² (a number of 22 digits) 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 (26366400227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81883070 + ... + 81883391.

It is an arithmetic number, because the mean of its divisors is an integer number (3930395088).

Almost surely, 2^26366400221 is an apocalyptic number.

It is an amenable number.

26366400221 is a deficient number, since it is larger than the sum of its proper divisors (5076760483).

26366400221 is a wasteful number, since it uses less digits than its factorization.

26366400221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163766491.

The product of its (nonzero) digits is 20736, while the sum is 32.

Adding to 26366400221 its reverse (12200466362), we get a palindrome (38566866583).

The spelling of 26366400221 in words is "twenty-six billion, three hundred sixty-six million, four hundred thousand, two hundred twenty-one".