266401324221 has 8 divisors (see below), whose sum is σ = 357061461504. Its totient is φ = 176671034880.

The previous prime is 266401324151. The next prime is 266401324249. The reversal of 266401324221 is 122423104662.

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

It is not a de Polignac number, because 266401324221 - 2¹⁹ = 266400799933 is a prime.

It is a super-2 number, since 2×266401324221² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266401324271) 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, 232461316 + ... + 232462461.

It is an arithmetic number, because the mean of its divisors is an integer number (44632682688).

Almost surely, 2^266401324221 is an apocalyptic number.

It is an amenable number.

266401324221 is a deficient number, since it is larger than the sum of its proper divisors (90660137283).

266401324221 is a wasteful number, since it uses less digits than its factorization.

266401324221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464923971.

The product of its (nonzero) digits is 27648, while the sum is 33.

Adding to 266401324221 its reverse (122423104662), we get a palindrome (388824428883).

The spelling of 266401324221 in words is "two hundred sixty-six billion, four hundred one million, three hundred twenty-four thousand, two hundred twenty-one".