51021043247 has 2 divisors, whose sum is σ = 51021043248. Its totient is φ = 51021043246.

The previous prime is 51021043201. The next prime is 51021043279. The reversal of 51021043247 is 74234012015.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51021043247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51021543247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25510521623 + 25510521624.

It is an arithmetic number, because the mean of its divisors is an integer number (25510521624).

Almost surely, 2^51021043247 is an apocalyptic number.

51021043247 is a deficient number, since it is larger than the sum of its proper divisors (1).

51021043247 is an equidigital number, since it uses as much as digits as its factorization.

51021043247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 29.

The spelling of 51021043247 in words is "fifty-one billion, twenty-one million, forty-three thousand, two hundred forty-seven".