321140555501 has 16 divisors (see below), whose sum is σ = 330568539648. Its totient is φ = 311752800000.

The previous prime is 321140555459. The next prime is 321140555543. The reversal of 321140555501 is 105555041123.

It is an interprime number because it is at equal distance from previous prime (321140555459) and next prime (321140555543).

It is a cyclic number.

It is not a de Polignac number, because 321140555501 - 2¹⁰ = 321140554477 is a prime.

It is a super-2 number, since 2×321140555501² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321140555581) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33367376 + ... + 33376998.

It is an arithmetic number, because the mean of its divisors is an integer number (20660533728).

Almost surely, 2^321140555501 is an apocalyptic number.

It is an amenable number.

321140555501 is a deficient number, since it is larger than the sum of its proper divisors (9427984147).

321140555501 is a wasteful number, since it uses less digits than its factorization.

321140555501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11612.

The product of its (nonzero) digits is 15000, while the sum is 32.

Adding to 321140555501 its reverse (105555041123), we get a palindrome (426695596624).

The spelling of 321140555501 in words is "three hundred twenty-one billion, one hundred forty million, five hundred fifty-five thousand, five hundred one".