1021222202100 has 72 divisors (see below), whose sum is σ = 2970206227968. Its totient is φ = 270900115200.

The previous prime is 1021222202071. The next prime is 1021222202141. The reversal of 1021222202100 is 12022221201.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1021222202100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8853889 + ... + 8968488.

Almost surely, 2^{1021222202100} is an apocalyptic number.

1021222202100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021222202100 is an abundant number, since it is smaller than the sum of its proper divisors (1948984025868).

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

1021222202100 is a wasteful number, since it uses less digits than its factorization.

1021222202100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17822585 (or 17822578 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 1021222202100 its reverse (12022221201), we get a palindrome (1033244423301).

The spelling of 1021222202100 in words is "one trillion, twenty-one billion, two hundred twenty-two million, two hundred two thousand, one hundred".