1021222222100 has 36 divisors (see below), whose sum is σ = 2216123513184. Its totient is φ = 408475747680.

The previous prime is 1021222222091. The next prime is 1021222222103. The reversal of 1021222222100 is 12222221201.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021222222103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3329417 + ... + 3623183.

Almost surely, 2^{1021222222100} is an apocalyptic number.

1021222222100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021222222100 is an abundant number, since it is smaller than the sum of its proper divisors (1194901291084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1021222222100 is a wasteful number, since it uses less digits than its factorization.

1021222222100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328544 (or 328537 counting only the distinct ones).

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

Adding to 1021222222100 its reverse (12222221201), we get a palindrome (1033444443301).

The spelling of 1021222222100 in words is "one trillion, twenty-one billion, two hundred twenty-two million, two hundred twenty-two thousand, one hundred".