21101221111320 has 96 divisors (see below), whose sum is σ = 78375964137120. Its totient is φ = 4823136253440.

The previous prime is 21101221111309. The next prime is 21101221111387. The reversal of 21101221111320 is 2311112210112.

It is a happy number.

21101221111320 is a `hidden beast` number, since 2 + 1 + 10 + 1 + 221 + 111 + 320 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21101221111293 and 21101221111302.

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, 4186747701 + ... + 4186752740.

It is an arithmetic number, because the mean of its divisors is an integer number (816416293095).

Almost surely, 2^{21101221111320} is an apocalyptic number.

21101221111320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101221111320 is an abundant number, since it is smaller than the sum of its proper divisors (57274743025800).

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

21101221111320 is a wasteful number, since it uses less digits than its factorization.

21101221111320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8373500465 (or 8373500458 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 21101221111320 its reverse (2311112210112), we get a palindrome (23412333321432).

The spelling of 21101221111320 in words is "twenty-one trillion, one hundred one billion, two hundred twenty-one million, one hundred eleven thousand, three hundred twenty".