1021222222021 has 8 divisors (see below), whose sum is σ = 1093443491160. Its totient is φ = 950350883328.

The previous prime is 1021222222003. The next prime is 1021222222037. The reversal of 1021222222021 is 1202222221201.

It can be written as a sum of positive squares in 4 ways, for example, as 279720400996 + 741501821025 = 528886^2 + 861105^2 .

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 1021222222021 - 2¹¹ = 1021222219973 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 1021222222021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021222222051) 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, 337481046 + ... + 337484071.

It is an arithmetic number, because the mean of its divisors is an integer number (136680436395).

Almost surely, 2^{1021222222021} is an apocalyptic number.

It is an amenable number.

1021222222021 is a deficient number, since it is larger than the sum of its proper divisors (72221269139).

1021222222021 is an equidigital number, since it uses as much as digits as its factorization.

1021222222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674965223.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 1021222222021 its reverse (1202222221201), we get a palindrome (2223444443222).

The spelling of 1021222222021 in words is "one trillion, twenty-one billion, two hundred twenty-two million, two hundred twenty-two thousand, twenty-one".