1212202011221 has 16 divisors (see below), whose sum is σ = 1254762062400. Its totient is φ = 1170347004288.

The previous prime is 1212202011217. The next prime is 1212202011253. The reversal of 1212202011221 is 1221102022121.

It is a cyclic number.

It is not a de Polignac number, because 1212202011221 - 2² = 1212202011217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1212202011221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212202011521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1655225 + ... + 2272481.

It is an arithmetic number, because the mean of its divisors is an integer number (78422628900).

Almost surely, 2^{1212202011221} is an apocalyptic number.

It is an amenable number.

1212202011221 is a deficient number, since it is larger than the sum of its proper divisors (42560051179).

1212202011221 is a wasteful number, since it uses less digits than its factorization.

1212202011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617828.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1212202011221 its reverse (1221102022121), we get a palindrome (2433304033342).

The spelling of 1212202011221 in words is "one trillion, two hundred twelve billion, two hundred two million, eleven thousand, two hundred twenty-one".