1021313002221 has 12 divisors (see below), whose sum is σ = 1475847432540. Its totient is φ = 680590316160.

The previous prime is 1021313002211. The next prime is 1021313002249. The reversal of 1021313002221 is 1222003131201.

1021313002221 is a `hidden beast` number, since 10 + 2 + 131 + 300 + 2 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 423652584996 + 597660417225 = 650886^2 + 773085^2 .

It is not a de Polignac number, because 1021313002221 - 2⁵ = 1021313002189 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1021313002194 and 1021313002203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021313002211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23728860 + ... + 23771861.

It is an arithmetic number, because the mean of its divisors is an integer number (122987286045).

Almost surely, 2^{1021313002221} is an apocalyptic number.

It is an amenable number.

1021313002221 is a deficient number, since it is larger than the sum of its proper divisors (454534430319).

1021313002221 is a wasteful number, since it uses less digits than its factorization.

1021313002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47503116 (or 47503113 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 1021313002221 its reverse (1222003131201), we get a palindrome (2243316133422).

The spelling of 1021313002221 in words is "one trillion, twenty-one billion, three hundred thirteen million, two thousand, two hundred twenty-one".