1021221313212 has 24 divisors (see below), whose sum is σ = 2384482979200. Its totient is φ = 340173783216.

The previous prime is 1021221313199. The next prime is 1021221313219. The reversal of 1021221313212 is 2123131221201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021221313219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29146912 + ... + 29181927.

Almost surely, 2^{1021221313212} is an apocalyptic number.

1021221313212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1021221313212 is an abundant number, since it is smaller than the sum of its proper divisors (1363261665988).

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

1021221313212 is a wasteful number, since it uses less digits than its factorization.

1021221313212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58330305 (or 58330303 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 1021221313212 its reverse (2123131221201), we get a palindrome (3144352534413).

The spelling of 1021221313212 in words is "one trillion, twenty-one billion, two hundred twenty-one million, three hundred thirteen thousand, two hundred twelve".