21121222030100 has 72 divisors (see below), whose sum is σ = 48573115371648. Its totient is φ = 7944309184000.

The previous prime is 21121222030081. The next prime is 21121222030123. The reversal of 21121222030100 is 103022212112.

It is a super-2 number, since 2×21121222030100² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

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, 3756926 + ... + 7507125.

It is an arithmetic number, because the mean of its divisors is an integer number (674626602384).

Almost surely, 2^{21121222030100} is an apocalyptic number.

21121222030100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21121222030100 is an abundant number, since it is smaller than the sum of its proper divisors (27451893341548).

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

21121222030100 is a wasteful number, since it uses less digits than its factorization.

21121222030100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11265185 (or 11265178 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21121222030100 its reverse (103022212112), we get a palindrome (21224244242212).

The spelling of 21121222030100 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred twenty-two million, thirty thousand, one hundred".