1021210102221 has 16 divisors (see below), whose sum is σ = 1459214438784. Its totient is φ = 633606266304.

The previous prime is 1021210102217. The next prime is 1021210102247. The reversal of 1021210102221 is 1222010121201.

It is not a de Polignac number, because 1021210102221 - 2² = 1021210102217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1021210102221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021210102271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 199999426 + ... + 200004531.

It is an arithmetic number, because the mean of its divisors is an integer number (91200902424).

Almost surely, 2^{1021210102221} is an apocalyptic number.

It is an amenable number.

1021210102221 is a deficient number, since it is larger than the sum of its proper divisors (438004336563).

1021210102221 is a wasteful number, since it uses less digits than its factorization.

1021210102221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400004020.

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

Adding to 1021210102221 its reverse (1222010121201), we get a palindrome (2243220223422).

The spelling of 1021210102221 in words is "one trillion, twenty-one billion, two hundred ten million, one hundred two thousand, two hundred twenty-one".