61024512221 has 4 divisors (see below), whose sum is σ = 61759747392. Its totient is φ = 60289277052.

The previous prime is 61024512187. The next prime is 61024512233. The reversal of 61024512221 is 12221542016.

61024512221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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-61024512221 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 (61024517221) 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, 367617461 + ... + 367617626.

It is an arithmetic number, because the mean of its divisors is an integer number (15439936848).

Almost surely, 2^61024512221 is an apocalyptic number.

It is an amenable number.

61024512221 is a deficient number, since it is larger than the sum of its proper divisors (735235171).

61024512221 is an equidigital number, since it uses as much as digits as its factorization.

61024512221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735235170.

The product of its (nonzero) digits is 1920, while the sum is 26.

The spelling of 61024512221 in words is "sixty-one billion, twenty-four million, five hundred twelve thousand, two hundred twenty-one".