320185515421 has 2 divisors, whose sum is σ = 320185515422. Its totient is φ = 320185515420.

The previous prime is 320185515407. The next prime is 320185515431. The reversal of 320185515421 is 124515581023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 279482452921 + 40703062500 = 528661^2 + 201750^2 .

It is a cyclic number.

It is not a de Polignac number, because 320185515421 - 2¹⁷ = 320185384349 is a prime.

It is a super-2 number, since 2×320185515421² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320185515431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160092757710 + 160092757711.

It is an arithmetic number, because the mean of its divisors is an integer number (160092757711).

Almost surely, 2^320185515421 is an apocalyptic number.

It is an amenable number.

320185515421 is a deficient number, since it is larger than the sum of its proper divisors (1).

320185515421 is an equidigital number, since it uses as much as digits as its factorization.

320185515421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48000, while the sum is 37.

The spelling of 320185515421 in words is "three hundred twenty billion, one hundred eighty-five million, five hundred fifteen thousand, four hundred twenty-one".