321651621242 has 16 divisors (see below), whose sum is σ = 561806606592. Its totient is φ = 135249738000.

The previous prime is 321651621233. The next prime is 321651621283. The reversal of 321651621242 is 242126156123.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216745634 + ... + 216747117.

It is an arithmetic number, because the mean of its divisors is an integer number (35112912912).

Almost surely, 2^321651621242 is an apocalyptic number.

321651621242 is a deficient number, since it is larger than the sum of its proper divisors (240154985350).

321651621242 is a wasteful number, since it uses less digits than its factorization.

321651621242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433492813.

The product of its digits is 34560, while the sum is 35.

Adding to 321651621242 its reverse (242126156123), we get a palindrome (563777777365).

The spelling of 321651621242 in words is "three hundred twenty-one billion, six hundred fifty-one million, six hundred twenty-one thousand, two hundred forty-two".