61363713221 has 4 divisors (see below), whose sum is σ = 62227990944. Its totient is φ = 60499435500.

The previous prime is 61363713211. The next prime is 61363713311. The reversal of 61363713221 is 12231736316.

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 not a de Polignac number, because 61363713221 - 2⁶ = 61363713157 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 (61363713211) 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, 432138755 + ... + 432138896.

It is an arithmetic number, because the mean of its divisors is an integer number (15556997736).

Almost surely, 2^61363713221 is an apocalyptic number.

It is an amenable number.

61363713221 is a deficient number, since it is larger than the sum of its proper divisors (864277723).

61363713221 is an equidigital number, since it uses as much as digits as its factorization.

61363713221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864277722.

The product of its digits is 27216, while the sum is 35.

The spelling of 61363713221 in words is "sixty-one billion, three hundred sixty-three million, seven hundred thirteen thousand, two hundred twenty-one".