61221023247 has 4 divisors (see below), whose sum is σ = 81628031000. Its totient is φ = 40814015496.

The previous prime is 61221023239. The next prime is 61221023273. The reversal of 61221023247 is 74232012216.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 61221023247 - 2³ = 61221023239 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 (61221025247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10203503872 + ... + 10203503877.

It is an arithmetic number, because the mean of its divisors is an integer number (20407007750).

Almost surely, 2^61221023247 is an apocalyptic number.

61221023247 is a deficient number, since it is larger than the sum of its proper divisors (20407007753).

61221023247 is a wasteful number, since it uses less digits than its factorization.

61221023247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20407007752.

The product of its (nonzero) digits is 8064, while the sum is 30.

The spelling of 61221023247 in words is "sixty-one billion, two hundred twenty-one million, twenty-three thousand, two hundred forty-seven".