421001420338997 has 2 divisors, whose sum is σ = 421001420338998. Its totient is φ = 421001420338996.

The previous prime is 421001420338991. The next prime is 421001420339009. The reversal of 421001420338997 is 799833024100124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 226272624454321 + 194728795884676 = 15042361^2 + 13954526^2 .

It is a cyclic number.

It is not a de Polignac number, because 421001420338997 - 2²⁰ = 421001419290421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421001420338991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210500710169498 + 210500710169499.

It is an arithmetic number, because the mean of its divisors is an integer number (210500710169499).

Almost surely, 2^{421001420338997} is an apocalyptic number.

It is an amenable number.

421001420338997 is a deficient number, since it is larger than the sum of its proper divisors (1).

421001420338997 is an equidigital number, since it uses as much as digits as its factorization.

421001420338997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2612736, while the sum is 53.

The spelling of 421001420338997 in words is "four hundred twenty-one trillion, one billion, four hundred twenty million, three hundred thirty-eight thousand, nine hundred ninety-seven".