321212421 has 24 divisors (see below), whose sum is σ = 483724800. Its totient is φ = 205164000.

The previous prime is 321212417. The next prime is 321212453. The reversal of 321212421 is 124212123.

It is a happy number.

321212421 is a `hidden beast` number, since 32 + 1 + 212 + 421 = 666.

It is not a de Polignac number, because 321212421 - 2² = 321212417 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 321212394 and 321212403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321212321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22480 + ... + 33878.

It is an arithmetic number, because the mean of its divisors is an integer number (20155200).

Almost surely, 2^321212421 is an apocalyptic number.

321212421 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

321212421 is a deficient number, since it is larger than the sum of its proper divisors (162512379).

321212421 is a wasteful number, since it uses less digits than its factorization.

321212421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11537 (or 11534 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 321212421 is about 17922.3999787975. The cubic root of 321212421 is about 684.8531277986.

Adding to 321212421 its reverse (124212123), we get a palindrome (445424544).

The spelling of 321212421 in words is "three hundred twenty-one million, two hundred twelve thousand, four hundred twenty-one".