321400061 has 4 divisors (see below), whose sum is σ = 321436224. Its totient is φ = 321363900.

The previous prime is 321400021. The next prime is 321400097. The reversal of 321400061 is 160004123.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 160004123 = 23 ⋅6956701.

It is a cyclic number.

It is not a de Polignac number, because 321400061 - 2⁶ = 321399997 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 (321400021) 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, 5516 + ... + 25946.

It is an arithmetic number, because the mean of its divisors is an integer number (80359056).

Almost surely, 2^321400061 is an apocalyptic number.

It is an amenable number.

321400061 is a deficient number, since it is larger than the sum of its proper divisors (36163).

321400061 is a wasteful number, since it uses less digits than its factorization.

321400061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36162.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 321400061 is about 17927.6340045194. The cubic root of 321400061 is about 684.9864568335.

Adding to 321400061 its reverse (160004123), we get a palindrome (481404184).

The spelling of 321400061 in words is "three hundred twenty-one million, four hundred thousand, sixty-one".