1021021201221 has 64 divisors (see below), whose sum is σ = 1650727372800. Its totient is φ = 548357112576.

The previous prime is 1021021201199. The next prime is 1021021201231. The reversal of 1021021201221 is 1221021201201.

It is not a de Polignac number, because 1021021201221 - 2⁹ = 1021021200709 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1021021201221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021021201231) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 41269371 + ... + 41294103.

It is an arithmetic number, because the mean of its divisors is an integer number (25792615200).

Almost surely, 2^{1021021201221} is an apocalyptic number.

It is an amenable number.

1021021201221 is a deficient number, since it is larger than the sum of its proper divisors (629706171579).

1021021201221 is a wasteful number, since it uses less digits than its factorization.

1021021201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25578.

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

Adding to 1021021201221 its reverse (1221021201201), we get a palindrome (2242042402422).

The spelling of 1021021201221 in words is "one trillion, twenty-one billion, twenty-one million, two hundred one thousand, two hundred twenty-one".