1210011220221 has 16 divisors (see below), whose sum is σ = 1631386753920. Its totient is φ = 797684345280.

The previous prime is 1210011220163. The next prime is 1210011220241. The reversal of 1210011220221 is 1220221100121.

It is not a de Polignac number, because 1210011220221 - 2¹³ = 1210011212029 is a prime.

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 1210011220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210011220241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3513790 + ... + 3842751.

It is an arithmetic number, because the mean of its divisors is an integer number (101961672120).

Almost surely, 2^{1210011220221} is an apocalyptic number.

It is an amenable number.

1210011220221 is a deficient number, since it is larger than the sum of its proper divisors (421375533699).

1210011220221 is a wasteful number, since it uses less digits than its factorization.

1210011220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7357156.

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

Adding to 1210011220221 its reverse (1220221100121), we get a palindrome (2430232320342).

The spelling of 1210011220221 in words is "one trillion, two hundred ten billion, eleven million, two hundred twenty thousand, two hundred twenty-one".