401221311 has 4 divisors (see below), whose sum is σ = 534961752. Its totient is φ = 267480872.

The previous prime is 401221307. The next prime is 401221333. The reversal of 401221311 is 113122104.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 401221311 - 2² = 401221307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401220311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66870216 + ... + 66870221.

It is an arithmetic number, because the mean of its divisors is an integer number (133740438).

Almost surely, 2^401221311 is an apocalyptic number.

401221311 is a deficient number, since it is larger than the sum of its proper divisors (133740441).

401221311 is a wasteful number, since it uses less digits than its factorization.

401221311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133740440.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 401221311 is about 20030.5095042538. The cubic root of 401221311 is about 737.5554291768. Note that the first 3 decimals are identical.

Adding to 401221311 its reverse (113122104), we get a palindrome (514343415).

The spelling of 401221311 in words is "four hundred one million, two hundred twenty-one thousand, three hundred eleven".