180321421 has 6 divisors (see below), whose sum is σ = 209761710. Its totient is φ = 154561176.

The previous prime is 180321409. The next prime is 180321433. The reversal of 180321421 is 124123081.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (180321409) and next prime (180321433).

It can be written as a sum of positive squares in only one way, i.e., 141943396 + 38378025 = 11914^2 + 6195^2 .

It is not a de Polignac number, because 180321421 - 2²¹ = 178224269 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 180321392 and 180321401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180321481) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1839966 + ... + 1840063.

It is an arithmetic number, because the mean of its divisors is an integer number (34960285).

Almost surely, 2^180321421 is an apocalyptic number.

It is an amenable number.

180321421 is a deficient number, since it is larger than the sum of its proper divisors (29440289).

180321421 is an equidigital number, since it uses as much as digits as its factorization.

180321421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3680043 (or 3680036 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 180321421 is about 13428.3811757039. The cubic root of 180321421 is about 564.9574938655.

The spelling of 180321421 in words is "one hundred eighty million, three hundred twenty-one thousand, four hundred twenty-one".