321533551051 has 4 divisors (see below), whose sum is σ = 322150698504. Its totient is φ = 320916403600.

The previous prime is 321533551043. The next prime is 321533551057. The reversal of 321533551051 is 150155335123.

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 321533551051 - 2³ = 321533551043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 321533550998 and 321533551016.

It is not an unprimeable number, because it can be changed into a prime (321533551057) 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, 308572945 + ... + 308573986.

It is an arithmetic number, because the mean of its divisors is an integer number (80537674626).

Almost surely, 2^321533551051 is an apocalyptic number.

321533551051 is a deficient number, since it is larger than the sum of its proper divisors (617147453).

321533551051 is an equidigital number, since it uses as much as digits as its factorization.

321533551051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617147452.

The product of its (nonzero) digits is 33750, while the sum is 34.

Adding to 321533551051 its reverse (150155335123), we get a palindrome (471688886174).

The spelling of 321533551051 in words is "three hundred twenty-one billion, five hundred thirty-three million, five hundred fifty-one thousand, fifty-one".