61221121244287 has 2 divisors, whose sum is σ = 61221121244288. Its totient is φ = 61221121244286.

The previous prime is 61221121244251. The next prime is 61221121244417. The reversal of 61221121244287 is 78244212112216.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61221121244287 is a prime.

It is a super-2 number, since 2×61221121244287² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61221121245287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30610560622143 + 30610560622144.

It is an arithmetic number, because the mean of its divisors is an integer number (30610560622144).

Almost surely, 2^{61221121244287} is an apocalyptic number.

61221121244287 is a deficient number, since it is larger than the sum of its proper divisors (1).

61221121244287 is an equidigital number, since it uses as much as digits as its factorization.

61221121244287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172032, while the sum is 43.

The spelling of 61221121244287 in words is "sixty-one trillion, two hundred twenty-one billion, one hundred twenty-one million, two hundred forty-four thousand, two hundred eighty-seven".