1021211002221 has 8 divisors (see below), whose sum is σ = 1368456955200. Its totient is φ = 677386192032.

The previous prime is 1021211002171. The next prime is 1021211002237. The reversal of 1021211002221 is 1222001121201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1021211002221 - 2²⁷ = 1021076784493 is a prime.

It is a super-2 number, since 2×1021211002221² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1021211002221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021211002271) 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 7 ways as a sum of consecutive naturals, for example, 855285000 + ... + 855286193.

It is an arithmetic number, because the mean of its divisors is an integer number (171057119400).

Almost surely, 2^{1021211002221} is an apocalyptic number.

It is an amenable number.

1021211002221 is a deficient number, since it is larger than the sum of its proper divisors (347245952979).

1021211002221 is a wasteful number, since it uses less digits than its factorization.

1021211002221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1710571395.

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

Adding to 1021211002221 its reverse (1222001121201), we get a palindrome (2243212123422).

The spelling of 1021211002221 in words is "one trillion, twenty-one billion, two hundred eleven million, two thousand, two hundred twenty-one".