1020000221197 has 4 divisors (see below), whose sum is σ = 1020013975836. Its totient is φ = 1019986466560.

The previous prime is 1020000221147. The next prime is 1020000221231. The reversal of 1020000221197 is 7911220000201.

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 550869746436 + 469130474761 = 742206^2 + 684931^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020000221197 - 2²³ = 1019991832589 is a prime.

It is a super-2 number, since 2×1020000221197² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020000221117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6765478 + ... + 6914599.

It is an arithmetic number, because the mean of its divisors is an integer number (255003493959).

Almost surely, 2^{1020000221197} is an apocalyptic number.

It is an amenable number.

1020000221197 is a deficient number, since it is larger than the sum of its proper divisors (13754639).

1020000221197 is an equidigital number, since it uses as much as digits as its factorization.

1020000221197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13754638.

The product of its (nonzero) digits is 504, while the sum is 25.

Adding to 1020000221197 its reverse (7911220000201), we get a palindrome (8931220221398).

The spelling of 1020000221197 in words is "one trillion, twenty billion, two hundred twenty-one thousand, one hundred ninety-seven".