1022200120021 has 4 divisors (see below), whose sum is σ = 1022202784044. Its totient is φ = 1022197456000.

The previous prime is 1022200120013. The next prime is 1022200120031. The reversal of 1022200120021 is 1200210022201.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 942376919121 + 79823200900 = 970761^2 + 282530^2 .

It is a cyclic number.

It is not a de Polignac number, because 1022200120021 - 2³ = 1022200120013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1022200119983 and 1022200120010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1022200120031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 634810 + ... + 1564411.

It is an arithmetic number, because the mean of its divisors is an integer number (255550696011).

Almost surely, 2^{1022200120021} is an apocalyptic number.

It is an amenable number.

1022200120021 is a deficient number, since it is larger than the sum of its proper divisors (2664023).

1022200120021 is an equidigital number, since it uses as much as digits as its factorization.

1022200120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2664022.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1022200120021 its reverse (1200210022201), we get a palindrome (2222410142222).

The spelling of 1022200120021 in words is "one trillion, twenty-two billion, two hundred million, one hundred twenty thousand, twenty-one".