2661463230221 has 4 divisors (see below), whose sum is σ = 2661467370912. Its totient is φ = 2661459089532.

The previous prime is 2661463230199. The next prime is 2661463230241. The reversal of 2661463230221 is 1220323641662.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2661463230221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661463230241) 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, 876881 + ... + 2468166.

It is an arithmetic number, because the mean of its divisors is an integer number (665366842728).

Almost surely, 2^{2661463230221} is an apocalyptic number.

It is an amenable number.

2661463230221 is a deficient number, since it is larger than the sum of its proper divisors (4140691).

2661463230221 is an equidigital number, since it uses as much as digits as its factorization.

2661463230221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4140690.

The product of its (nonzero) digits is 124416, while the sum is 38.

Adding to 2661463230221 its reverse (1220323641662), we get a palindrome (3881786871883).

The spelling of 2661463230221 in words is "two trillion, six hundred sixty-one billion, four hundred sixty-three million, two hundred thirty thousand, two hundred twenty-one".