421261999 has 2 divisors, whose sum is σ = 421262000. Its totient is φ = 421261998.

The previous prime is 421261991. The next prime is 421262041. The reversal of 421261999 is 999162124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421261999 - 2³ = 421261991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421261991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210630999 + 210631000.

It is an arithmetic number, because the mean of its divisors is an integer number (210631000).

Almost surely, 2^421261999 is an apocalyptic number.

421261999 is a deficient number, since it is larger than the sum of its proper divisors (1).

421261999 is an equidigital number, since it uses as much as digits as its factorization.

421261999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 43.

The square root of 421261999 is about 20524.6680606533. The cubic root of 421261999 is about 749.6365640624.

The spelling of 421261999 in words is "four hundred twenty-one million, two hundred sixty-one thousand, nine hundred ninety-nine".