21113112211020 has 72 divisors (see below), whose sum is σ = 64945122671520. Its totient is φ = 5550865178880.

The previous prime is 21113112211007. The next prime is 21113112211043. The reversal of 21113112211020 is 2011221131112.

It is a happy number.

21113112211020 is a `hidden beast` number, since 2 + 111 + 311 + 221 + 1 + 0 + 20 = 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 = 21113112210984 and 21113112211002.

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, 826008825 + ... + 826034384.

It is an arithmetic number, because the mean of its divisors is an integer number (902015592660).

Almost surely, 2^{21113112211020} is an apocalyptic number.

21113112211020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21113112211020 is an abundant number, since it is smaller than the sum of its proper divisors (43832010460500).

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

21113112211020 is a wasteful number, since it uses less digits than its factorization.

21113112211020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1652043295 (or 1652043290 counting only the distinct ones).

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

Adding to 21113112211020 its reverse (2011221131112), we get a palindrome (23124333342132).

The spelling of 21113112211020 in words is "twenty-one trillion, one hundred thirteen billion, one hundred twelve million, two hundred eleven thousand, twenty".