1212021100221 has 32 divisors (see below), whose sum is σ = 1670065453440. Its totient is φ = 781273817856.

The previous prime is 1212021100211. The next prime is 1212021100231. The reversal of 1212021100221 is 1220011202121.

It is an interprime number because it is at equal distance from previous prime (1212021100211) and next prime (1212021100231).

It is not a de Polignac number, because 1212021100221 - 2²⁹ = 1211484229309 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1212021100221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212021100211) 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, 31711695 + ... + 31749891.

It is an arithmetic number, because the mean of its divisors is an integer number (52189545420).

Almost surely, 2^{1212021100221} is an apocalyptic number.

It is an amenable number.

1212021100221 is a deficient number, since it is larger than the sum of its proper divisors (458044353219).

1212021100221 is a wasteful number, since it uses less digits than its factorization.

1212021100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40013.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1212021100221 its reverse (1220011202121), we get a palindrome (2432032302342).

The spelling of 1212021100221 in words is "one trillion, two hundred twelve billion, twenty-one million, one hundred thousand, two hundred twenty-one".