1421534473721 has 2 divisors, whose sum is σ = 1421534473722. Its totient is φ = 1421534473720.

The previous prime is 1421534473703. The next prime is 1421534473757. The reversal of 1421534473721 is 1273744351241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1416661735696 + 4872738025 = 1190236^2 + 69805^2 .

It is an emirp because it is prime and its reverse (1273744351241) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1421534473721 is a prime.

It is not a weakly prime, because it can be changed into another prime (1421534473781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710767236860 + 710767236861.

It is an arithmetic number, because the mean of its divisors is an integer number (710767236861).

Almost surely, 2^{1421534473721} is an apocalyptic number.

It is an amenable number.

1421534473721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421534473721 is an equidigital number, since it uses as much as digits as its factorization.

1421534473721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 564480, while the sum is 44.

The spelling of 1421534473721 in words is "one trillion, four hundred twenty-one billion, five hundred thirty-four million, four hundred seventy-three thousand, seven hundred twenty-one".