61146222321 has 4 divisors (see below), whose sum is σ = 81528296432. Its totient is φ = 40764148212.

The previous prime is 61146222317. The next prime is 61146222323. The reversal of 61146222321 is 12322264116.

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.

It is not a de Polignac number, because 61146222321 - 2² = 61146222317 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61146222323) 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, 10191037051 + ... + 10191037056.

It is an arithmetic number, because the mean of its divisors is an integer number (20382074108).

Almost surely, 2^61146222321 is an apocalyptic number.

It is an amenable number.

61146222321 is a deficient number, since it is larger than the sum of its proper divisors (20382074111).

61146222321 is a wasteful number, since it uses less digits than its factorization.

61146222321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20382074110.

The product of its digits is 6912, while the sum is 30.

Adding to 61146222321 its reverse (12322264116), we get a palindrome (73468486437).

The spelling of 61146222321 in words is "sixty-one billion, one hundred forty-six million, two hundred twenty-two thousand, three hundred twenty-one".