1021210011221 has 8 divisors (see below), whose sum is σ = 1032704875800. Its totient is φ = 1009715604480.

The previous prime is 1021210011191. The next prime is 1021210011223. The reversal of 1021210011221 is 1221100121201.

It can be written as a sum of positive squares in 4 ways, for example, as 489980400196 + 531229611025 = 699986^2 + 728855^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1021210011221 - 2³⁸ = 746332104277 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021210011196 and 1021210011205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021210011223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6527291 + ... + 6681911.

It is an arithmetic number, because the mean of its divisors is an integer number (129088109475).

Almost surely, 2^{1021210011221} is an apocalyptic number.

It is an amenable number.

1021210011221 is a deficient number, since it is larger than the sum of its proper divisors (11494864579).

1021210011221 is an equidigital number, since it uses as much as digits as its factorization.

1021210011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228919.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1021210011221 its reverse (1221100121201), we get a palindrome (2242310132422).

The spelling of 1021210011221 in words is "one trillion, twenty-one billion, two hundred ten million, eleven thousand, two hundred twenty-one".