321140001551 has 4 divisors (see below), whose sum is σ = 322996302312. Its totient is φ = 319283700792.

The previous prime is 321140001541. The next prime is 321140001571. The reversal of 321140001551 is 155100041123.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 321140001551 - 2²⁶ = 321072892687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321140001521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 928150121 + ... + 928150466.

It is an arithmetic number, because the mean of its divisors is an integer number (80749075578).

Almost surely, 2^321140001551 is an apocalyptic number.

321140001551 is a deficient number, since it is larger than the sum of its proper divisors (1856300761).

321140001551 is a wasteful number, since it uses less digits than its factorization.

321140001551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1856300760.

The product of its (nonzero) digits is 600, while the sum is 23.

Adding to 321140001551 its reverse (155100041123), we get a palindrome (476240042674).

The spelling of 321140001551 in words is "three hundred twenty-one billion, one hundred forty million, one thousand, five hundred fifty-one".