213221401 has 6 divisors (see below), whose sum is σ = 225034602. Its totient is φ = 201998880.

The previous prime is 213221389. The next prime is 213221419. The reversal of 213221401 is 104122312.

It can be written as a sum of positive squares in only one way, i.e., 166435801 + 46785600 = 12901^2 + 6840^2 .

It is not a de Polignac number, because 213221401 - 2¹⁷ = 213090329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213221471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 294960 + ... + 295681.

It is an arithmetic number, because the mean of its divisors is an integer number (37505767).

Almost surely, 2^213221401 is an apocalyptic number.

It is an amenable number.

213221401 is a deficient number, since it is larger than the sum of its proper divisors (11813201).

213221401 is an equidigital number, since it uses as much as digits as its factorization.

213221401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 590679 (or 590660 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 213221401 is about 14602.1026225678. The cubic root of 213221401 is about 597.4161116566.

Adding to 213221401 its reverse (104122312), we get a palindrome (317343713).

The spelling of 213221401 in words is "two hundred thirteen million, two hundred twenty-one thousand, four hundred one".