1212313021221 has 8 divisors (see below), whose sum is σ = 1618804982304. Its totient is φ = 807014870480.

The previous prime is 1212313021219. The next prime is 1212313021277. The reversal of 1212313021221 is 1221203132121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1212313021221 - 2¹ = 1212313021219 is a prime.

It is a super-2 number, since 2×1212313021221² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212313021021) 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, 298450215 + ... + 298454276.

It is an arithmetic number, because the mean of its divisors is an integer number (202350622788).

Almost surely, 2^{1212313021221} is an apocalyptic number.

It is an amenable number.

1212313021221 is a deficient number, since it is larger than the sum of its proper divisors (406491961083).

1212313021221 is an equidigital number, since it uses as much as digits as its factorization.

1212313021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 596905171.

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

Adding to 1212313021221 its reverse (1221203132121), we get a palindrome (2433516153342).

The spelling of 1212313021221 in words is "one trillion, two hundred twelve billion, three hundred thirteen million, twenty-one thousand, two hundred twenty-one".