21120221022100 has 36 divisors (see below), whose sum is σ = 46411017352000. Its totient is φ = 8341150577760.

The previous prime is 21120221022059. The next prime is 21120221022139. The reversal of 21120221022100 is 122012202112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 1336714950 + ... + 1336730749.

Almost surely, 2^{21120221022100} is an apocalyptic number.

21120221022100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120221022100 is an abundant number, since it is smaller than the sum of its proper divisors (25290796329900).

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

21120221022100 is a wasteful number, since it uses less digits than its factorization.

21120221022100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2673445792 (or 2673445785 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21120221022100 its reverse (122012202112), we get a palindrome (21242233224212).

The spelling of 21120221022100 in words is "twenty-one trillion, one hundred twenty billion, two hundred twenty-one million, twenty-two thousand, one hundred".