321221142 has 48 divisors (see below), whose sum is σ = 777787920. Its totient is φ = 94963200.

The previous prime is 321221123. The next prime is 321221143. The reversal of 321221142 is 241122123.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321221143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11667 + ... + 27902.

It is an arithmetic number, because the mean of its divisors is an integer number (16203915).

Almost surely, 2^321221142 is an apocalyptic number.

321221142 is an abundant number, since it is smaller than the sum of its proper divisors (456566778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

321221142 is a wasteful number, since it uses less digits than its factorization.

321221142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39629 (or 39626 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 321221142 is about 17922.6432760349. The cubic root of 321221142 is about 684.8593257221.

Adding to 321221142 its reverse (241122123), we get a palindrome (562343265).

The spelling of 321221142 in words is "three hundred twenty-one million, two hundred twenty-one thousand, one hundred forty-two".