202121201100 has 144 divisors (see below), whose sum is σ = 719758876928. Its totient is φ = 42645346560.

The previous prime is 202121201099. The next prime is 202121201159. The reversal of 202121201100 is 1102121202.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3674554 + ... + 3729153.

Almost surely, 2^202121201100 is an apocalyptic number.

202121201100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202121201100 is an abundant number, since it is smaller than the sum of its proper divisors (517637675828).

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

202121201100 is a wasteful number, since it uses less digits than its factorization.

202121201100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7403744 (or 7403737 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 202121201100 its reverse (1102121202), we get a palindrome (203223322302).

The spelling of 202121201100 in words is "two hundred two billion, one hundred twenty-one million, two hundred one thousand, one hundred".