421021332 has 18 divisors (see below), whose sum is σ = 1064248458. Its totient is φ = 140340432.

The previous prime is 421021319. The next prime is 421021343. The reversal of 421021332 is 233120124.

421021332 is a `hidden beast` number, since 421 + 0 + 213 + 32 = 666.

It can be written as a sum of positive squares in only one way, i.e., 420824196 + 197136 = 20514^2 + 444^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5847483 + ... + 5847554.

Almost surely, 2^421021332 is an apocalyptic number.

It is an amenable number.

421021332 is an abundant number, since it is smaller than the sum of its proper divisors (643227126).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421021332 is a wasteful number, since it uses less digits than its factorization.

421021332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11695047 (or 11695042 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 421021332 is about 20518.8043511312. The cubic root of 421021332 is about 749.4937810667.

Adding to 421021332 its reverse (233120124), we get a palindrome (654141456).

It can be divided in two parts, 42102 and 1332, that added together give a palindrome (43434).

The spelling of 421021332 in words is "four hundred twenty-one million, twenty-one thousand, three hundred thirty-two".