47721311711621 has 2 divisors, whose sum is σ = 47721311711622. Its totient is φ = 47721311711620.

The previous prime is 47721311711611. The next prime is 47721311711627. The reversal of 47721311711621 is 12611711312774.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24453123900100 + 23268187811521 = 4945010^2 + 4823711^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47721311711621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47721311711627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23860655855810 + 23860655855811.

It is an arithmetic number, because the mean of its divisors is an integer number (23860655855811).

Almost surely, 2^{47721311711621} is an apocalyptic number.

It is an amenable number.

47721311711621 is a deficient number, since it is larger than the sum of its proper divisors (1).

47721311711621 is an equidigital number, since it uses as much as digits as its factorization.

47721311711621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 98784, while the sum is 44.

The spelling of 47721311711621 in words is "forty-seven trillion, seven hundred twenty-one billion, three hundred eleven million, seven hundred eleven thousand, six hundred twenty-one".