1022220021221 has 8 divisors (see below), whose sum is σ = 1208535985920. Its totient is φ = 845975189808.

The previous prime is 1022220021139. The next prime is 1022220021253. The reversal of 1022220021221 is 1221200222201.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-1022220021221 is a prime.

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 1022220021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1022220021521) 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, 2517783101 + ... + 2517783506.

It is an arithmetic number, because the mean of its divisors is an integer number (151066998240).

Almost surely, 2^{1022220021221} is an apocalyptic number.

It is an amenable number.

1022220021221 is a deficient number, since it is larger than the sum of its proper divisors (186315964699).

1022220021221 is an equidigital number, since it uses as much as digits as its factorization.

1022220021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5035566643.

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

Adding to 1022220021221 its reverse (1221200222201), we get a palindrome (2243420243422).

The spelling of 1022220021221 in words is "one trillion, twenty-two billion, two hundred twenty million, twenty-one thousand, two hundred twenty-one".