1212001102221 has 32 divisors (see below), whose sum is σ = 1992742633728. Its totient is φ = 638070151680.

The previous prime is 1212001102187. The next prime is 1212001102237. The reversal of 1212001102221 is 1222011002121.

It is not a de Polignac number, because 1212001102221 - 2²⁷ = 1211866884493 is a prime.

It is a super-2 number, since 2×1212001102221² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1212001102221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212001100221) 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, 4118386 + ... + 4402851.

It is an arithmetic number, because the mean of its divisors is an integer number (62273207304).

Almost surely, 2^{1212001102221} is an apocalyptic number.

It is an amenable number.

1212001102221 is a deficient number, since it is larger than the sum of its proper divisors (780741531507).

1212001102221 is a wasteful number, since it uses less digits than its factorization.

1212001102221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8521781.

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

Adding to 1212001102221 its reverse (1222011002121), we get a palindrome (2434012104342).

The spelling of 1212001102221 in words is "one trillion, two hundred twelve billion, one million, one hundred two thousand, two hundred twenty-one".