1020210222221 has 8 divisors (see below), whose sum is σ = 1081375457400. Its totient is φ = 959173083648.

The previous prime is 1020210222211. The next prime is 1020210222223. The reversal of 1020210222221 is 1222220120201.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 105673755625 + 914536466596 = 325075^2 + 956314^2 .

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 1020210222221 - 2²⁶ = 1020143113357 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 Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1020210222221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020210222223) 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, 32007746 + ... + 32039603.

It is an arithmetic number, because the mean of its divisors is an integer number (135171932175).

Almost surely, 2^{1020210222221} is an apocalyptic number.

It is an amenable number.

1020210222221 is a deficient number, since it is larger than the sum of its proper divisors (61165235179).

1020210222221 is an equidigital number, since it uses as much as digits as its factorization.

1020210222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64048303.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 1020210222221 its reverse (1222220120201), we get a palindrome (2242430342422).

The spelling of 1020210222221 in words is "one trillion, twenty billion, two hundred ten million, two hundred twenty-two thousand, two hundred twenty-one".