1002221100 has 90 divisors (see below), whose sum is σ = 3248831124. Its totient is φ = 267256800.

The previous prime is 1002221089. The next prime is 1002221119. The reversal of 1002221100 is 11222001.

It is a tau number, because it is divible by the number of its divisors (90).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 53766 + ... + 69965.

Almost surely, 2^1002221100 is an apocalyptic number.

1002221100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1002221100 is an abundant number, since it is smaller than the sum of its proper divisors (2246610024).

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

1002221100 is a wasteful number, since it uses less digits than its factorization.

1002221100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123757 (or 123741 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1002221100 is about 31657.8757973431. The cubic root of 1002221100 is about 1000.7398191992.

Adding to 1002221100 its reverse (11222001), we get a palindrome (1013443101).

Subtracting from 1002221100 its reverse (11222001), we obtain a palindrome (990999099).

The spelling of 1002221100 in words is "one billion, two million, two hundred twenty-one thousand, one hundred".