421421153 has 2 divisors, whose sum is σ = 421421154. Its totient is φ = 421421152.

The previous prime is 421421149. The next prime is 421421201. The reversal of 421421153 is 351124124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 273968704 + 147452449 = 16552^2 + 12143^2 .

It is a cyclic number.

It is not a de Polignac number, because 421421153 - 2² = 421421149 is a prime.

It is equal to p_22416071 and since 421421153 and 22416071 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (421421053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210710576 + 210710577.

It is an arithmetic number, because the mean of its divisors is an integer number (210710577).

Almost surely, 2^421421153 is an apocalyptic number.

It is an amenable number.

421421153 is a deficient number, since it is larger than the sum of its proper divisors (1).

421421153 is an equidigital number, since it uses as much as digits as its factorization.

421421153 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960, while the sum is 23.

The square root of 421421153 is about 20528.5448339623. The cubic root of 421421153 is about 749.7309571291.

Adding to 421421153 its reverse (351124124), we get a palindrome (772545277).

The spelling of 421421153 in words is "four hundred twenty-one million, four hundred twenty-one thousand, one hundred fifty-three".