1001210221221 has 16 divisors (see below), whose sum is σ = 1533641392128. Its totient is φ = 569124730800.

The previous prime is 1001210221211. The next prime is 1001210221237. The reversal of 1001210221221 is 1221220121001.

1001210221221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1001210221221 - 2⁹ = 1001210220709 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1001210221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001210221211) 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, 124804045 + ... + 124812066.

It is an arithmetic number, because the mean of its divisors is an integer number (95852587008).

Almost surely, 2^{1001210221221} is an apocalyptic number.

It is an amenable number.

1001210221221 is a deficient number, since it is larger than the sum of its proper divisors (532431170907).

1001210221221 is a wasteful number, since it uses less digits than its factorization.

1001210221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249616312.

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

Adding to 1001210221221 its reverse (1221220121001), we get a palindrome (2222430342222).

The spelling of 1001210221221 in words is "one trillion, one billion, two hundred ten million, two hundred twenty-one thousand, two hundred twenty-one".