421531212 has 24 divisors (see below), whose sum is σ = 1026337536. Its totient is φ = 134401168.

The previous prime is 421531199. The next prime is 421531247. The reversal of 421531212 is 212135124.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 763368 + ... + 763919.

It is an arithmetic number, because the mean of its divisors is an integer number (42764064).

Almost surely, 2^421531212 is an apocalyptic number.

It is an amenable number.

421531212 is an abundant number, since it is smaller than the sum of its proper divisors (604806324).

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

421531212 is a wasteful number, since it uses less digits than its factorization.

421531212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1527317 (or 1527315 counting only the distinct ones).

The product of its digits is 480, while the sum is 21.

The square root of 421531212 is about 20531.2252922226. The cubic root of 421531212 is about 749.7962184135.

Adding to 421531212 its reverse (212135124), we get a palindrome (633666336).

It can be divided in two parts, 42153 and 1212, that added together give a triangular number (43365 = T₂₉₄).

The spelling of 421531212 in words is "four hundred twenty-one million, five hundred thirty-one thousand, two hundred twelve".