311221421 has 8 divisors (see below), whose sum is σ = 355818624. Its totient is φ = 266658480.

The previous prime is 311221403. The next prime is 311221423. The reversal of 311221421 is 124122113.

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 311221421 - 2¹⁸ = 310959277 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 311221421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311221423) 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, 15371 + ... + 29303.

It is an arithmetic number, because the mean of its divisors is an integer number (44477328).

Almost surely, 2^311221421 is an apocalyptic number.

It is an amenable number.

311221421 is a deficient number, since it is larger than the sum of its proper divisors (44597203).

311221421 is a wasteful number, since it uses less digits than its factorization.

311221421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17131.

The product of its digits is 96, while the sum is 17.

The square root of 311221421 is about 17641.4687880573. The cubic root of 311221421 is about 677.6776464389.

Adding to 311221421 its reverse (124122113), we get a palindrome (435343534).

The spelling of 311221421 in words is "three hundred eleven million, two hundred twenty-one thousand, four hundred twenty-one".