421520207 has 2 divisors, whose sum is σ = 421520208. Its totient is φ = 421520206.

The previous prime is 421520189. The next prime is 421520233. The reversal of 421520207 is 702025124.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421520207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421520107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210760103 + 210760104.

It is an arithmetic number, because the mean of its divisors is an integer number (210760104).

Almost surely, 2^421520207 is an apocalyptic number.

421520207 is a deficient number, since it is larger than the sum of its proper divisors (1).

421520207 is an equidigital number, since it uses as much as digits as its factorization.

421520207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 421520207 is about 20530.9572840625. The cubic root of 421520207 is about 749.7896933299.

The spelling of 421520207 in words is "four hundred twenty-one million, five hundred twenty thousand, two hundred seven".