421707824381 has 2 divisors, whose sum is σ = 421707824382. Its totient is φ = 421707824380.

The previous prime is 421707824357. The next prime is 421707824389. The reversal of 421707824381 is 183428707124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 372141481156 + 49566343225 = 610034^2 + 222635^2 .

It is a cyclic number.

It is not a de Polignac number, because 421707824381 - 2¹⁰ = 421707823357 is a prime.

It is a super-2 number, since 2×421707824381² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421707824389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210853912190 + 210853912191.

It is an arithmetic number, because the mean of its divisors is an integer number (210853912191).

Almost surely, 2^421707824381 is an apocalyptic number.

It is an amenable number.

421707824381 is a deficient number, since it is larger than the sum of its proper divisors (1).

421707824381 is an equidigital number, since it uses as much as digits as its factorization.

421707824381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 602112, while the sum is 47.

The spelling of 421707824381 in words is "four hundred twenty-one billion, seven hundred seven million, eight hundred twenty-four thousand, three hundred eighty-one".