61321321 has 8 divisors (see below), whose sum is σ = 63150984. Its totient is φ = 59500800.

The previous prime is 61321319. The next prime is 61321333. The reversal of 61321321 is 12312316.

It can be written as a sum of positive squares in 4 ways, for example, as 48108096 + 13213225 = 6936^2 + 3635^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61321321 - 2¹ = 61321319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61321361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12771 + ... + 16903.

It is an arithmetic number, because the mean of its divisors is an integer number (7893873).

Almost surely, 2^61321321 is an apocalyptic number.

It is an amenable number.

61321321 is a deficient number, since it is larger than the sum of its proper divisors (1829663).

61321321 is a wasteful number, since it uses less digits than its factorization.

61321321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4571.

The product of its digits is 216, while the sum is 19.

The square root of 61321321 is about 7830.7931271360. The cubic root of 61321321 is about 394.3396990462.

Adding to 61321321 its reverse (12312316), we get a palindrome (73633637).

The spelling of 61321321 in words is "sixty-one million, three hundred twenty-one thousand, three hundred twenty-one".