1021212321 has 32 divisors (see below), whose sum is σ = 1508761728. Its totient is φ = 611619840.

The previous prime is 1021212307. The next prime is 1021212331. The reversal of 1021212321 is 1232121201.

It is not a de Polignac number, because 1021212321 - 2⁹ = 1021211809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1021212321.

It is not an unprimeable number, because it can be changed into a prime (1021212331) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 94906 + ... + 105116.

It is an arithmetic number, because the mean of its divisors is an integer number (47148804).

Almost surely, 2^1021212321 is an apocalyptic number.

It is an amenable number.

1021212321 is a deficient number, since it is larger than the sum of its proper divisors (487549407).

1021212321 is a wasteful number, since it uses less digits than its factorization.

1021212321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10321.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1021212321 is about 31956.4128306041. The cubic root of 1021212321 is about 1007.0213588041.

Adding to 1021212321 its reverse (1232121201), we get a palindrome (2253333522).

The spelling of 1021212321 in words is "one billion, twenty-one million, two hundred twelve thousand, three hundred twenty-one".