421620533 has 2 divisors, whose sum is σ = 421620534. Its totient is φ = 421620532.

The previous prime is 421620449. The next prime is 421620581. The reversal of 421620533 is 335026124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 377835844 + 43784689 = 19438^2 + 6617^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421620533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421620733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210810266 + 210810267.

It is an arithmetic number, because the mean of its divisors is an integer number (210810267).

Almost surely, 2^421620533 is an apocalyptic number.

It is an amenable number.

421620533 is a deficient number, since it is larger than the sum of its proper divisors (1).

421620533 is an equidigital number, since it uses as much as digits as its factorization.

421620533 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 421620533 is about 20533.4004246739. The cubic root of 421620533 is about 749.8491744116.

Adding to 421620533 its reverse (335026124), we get a palindrome (756646657).

The spelling of 421620533 in words is "four hundred twenty-one million, six hundred twenty thousand, five hundred thirty-three".