421521153 has 16 divisors (see below), whose sum is σ = 565689600. Its totient is φ = 279190656.

The previous prime is 421521101. The next prime is 421521157. The reversal of 421521153 is 351125124.

It is a happy number.

It is not a de Polignac number, because 421521153 - 2¹⁸ = 421259009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (421521157) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 383701 + ... + 384797.

It is an arithmetic number, because the mean of its divisors is an integer number (35355600).

Almost surely, 2^421521153 is an apocalyptic number.

It is an amenable number.

421521153 is a deficient number, since it is larger than the sum of its proper divisors (144168447).

421521153 is a wasteful number, since it uses less digits than its factorization.

421521153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1816.

The product of its digits is 1200, while the sum is 24.

The square root of 421521153 is about 20530.9803224298. The cubic root of 421521153 is about 749.7902542366.

Adding to 421521153 its reverse (351125124), we get a palindrome (772646277).

The spelling of 421521153 in words is "four hundred twenty-one million, five hundred twenty-one thousand, one hundred fifty-three".