421520153 has 2 divisors, whose sum is σ = 421520154. Its totient is φ = 421520152.

The previous prime is 421520137. The next prime is 421520161. The reversal of 421520153 is 351025124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 407918809 + 13601344 = 20197^2 + 3688^2 .

It is a cyclic number.

It is not a de Polignac number, because 421520153 - 2⁴ = 421520137 is a prime.

It is not a weakly prime, because it can be changed into another prime (421520353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210760076 + 210760077.

It is an arithmetic number, because the mean of its divisors is an integer number (210760077).

Almost surely, 2^421520153 is an apocalyptic number.

It is an amenable number.

421520153 is a deficient number, since it is larger than the sum of its proper divisors (1).

421520153 is an equidigital number, since it uses as much as digits as its factorization.

421520153 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 421520153 is about 20530.9559689752. The cubic root of 421520153 is about 749.7896613120.

Adding to 421520153 its reverse (351025124), we get a palindrome (772545277).

The spelling of 421520153 in words is "four hundred twenty-one million, five hundred twenty thousand, one hundred fifty-three".