1212010211221 has 4 divisors (see below), whose sum is σ = 1212579499500. Its totient is φ = 1211440922944.

The previous prime is 1212010211189. The next prime is 1212010211233. The reversal of 1212010211221 is 1221120102121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 248491283121 + 963518928100 = 498489^2 + 981590^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212010211221 - 2⁵ = 1212010211189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212010211195 and 1212010211204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212010211281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 284640946 + ... + 284645203.

It is an arithmetic number, because the mean of its divisors is an integer number (303144874875).

Almost surely, 2^{1212010211221} is an apocalyptic number.

It is an amenable number.

1212010211221 is a deficient number, since it is larger than the sum of its proper divisors (569288279).

1212010211221 is an equidigital number, since it uses as much as digits as its factorization.

1212010211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569288278.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1212010211221 its reverse (1221120102121), we get a palindrome (2433130313342).

The spelling of 1212010211221 in words is "one trillion, two hundred twelve billion, ten million, two hundred eleven thousand, two hundred twenty-one".