1220010321221 has 16 divisors (see below), whose sum is σ = 1302954277680. Its totient is φ = 1138349936640.

The previous prime is 1220010321163. The next prime is 1220010321293. The reversal of 1220010321221 is 1221230100221.

It can be written as a sum of positive squares in 8 ways, for example, as 646182861025 + 573827460196 = 803855^2 + 757514^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220010321221 - 2¹⁸ = 1220010059077 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220010321221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220010371221) 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, 292865 + ... + 1589273.

It is an arithmetic number, because the mean of its divisors is an integer number (81434642355).

Almost surely, 2^{1220010321221} is an apocalyptic number.

It is an amenable number.

1220010321221 is a deficient number, since it is larger than the sum of its proper divisors (82943956459).

1220010321221 is a wasteful number, since it uses less digits than its factorization.

1220010321221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1296904.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 1220010321221 its reverse (1221230100221), we get a palindrome (2441240421442).

The spelling of 1220010321221 in words is "one trillion, two hundred twenty billion, ten million, three hundred twenty-one thousand, two hundred twenty-one".