1021221223198 has 16 divisors (see below), whose sum is σ = 1702619262576. Its totient is φ = 455433135040.

The previous prime is 1021221223177. The next prime is 1021221223199. The reversal of 1021221223198 is 8913221221201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021221223199) 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 7 ways as a sum of consecutive naturals, for example, 437915311 + ... + 437917642.

It is an arithmetic number, because the mean of its divisors is an integer number (106413703911).

Almost surely, 2^{1021221223198} is an apocalyptic number.

1021221223198 is a deficient number, since it is larger than the sum of its proper divisors (681398039378).

1021221223198 is a wasteful number, since it uses less digits than its factorization.

1021221223198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 875833019.

The product of its (nonzero) digits is 6912, while the sum is 34.

Adding to 1021221223198 its reverse (8913221221201), we get a palindrome (9934442444399).

The spelling of 1021221223198 in words is "one trillion, twenty-one billion, two hundred twenty-one million, two hundred twenty-three thousand, one hundred ninety-eight".