21111221030100 has 36 divisors (see below), whose sum is σ = 61081799514624. Its totient is φ = 5629658941280.

The previous prime is 21111221030059. The next prime is 21111221030113. The reversal of 21111221030100 is 103012211112.

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 21111221030100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35185368084 + ... + 35185368683.

It is an arithmetic number, because the mean of its divisors is an integer number (1696716653184).

Almost surely, 2^{21111221030100} is an apocalyptic number.

21111221030100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21111221030100 is an abundant number, since it is smaller than the sum of its proper divisors (39970578484524).

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

21111221030100 is a wasteful number, since it uses less digits than its factorization.

21111221030100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70370736784 (or 70370736777 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 21111221030100 its reverse (103012211112), we get a palindrome (21214233241212).

The spelling of 21111221030100 in words is "twenty-one trillion, one hundred eleven billion, two hundred twenty-one million, thirty thousand, one hundred".