21112012101220 has 48 divisors (see below), whose sum is σ = 46186344892800. Its totient is φ = 8099192718080.

The previous prime is 21112012101203. The next prime is 21112012101239. The reversal of 21112012101220 is 2210121021112.

It is a junction number, because it is equal to n+sod(n) for n = 21112012101194 and 21112012101203.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 218141080 + ... + 218237839.

It is an arithmetic number, because the mean of its divisors is an integer number (962215518600).

Almost surely, 2^{21112012101220} is an apocalyptic number.

21112012101220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112012101220 is an abundant number, since it is smaller than the sum of its proper divisors (25074332791580).

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

21112012101220 is a wasteful number, since it uses less digits than its factorization.

21112012101220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436379028 (or 436379026 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21112012101220 its reverse (2210121021112), we get a palindrome (23322133122332).

The spelling of 21112012101220 in words is "twenty-one trillion, one hundred twelve billion, twelve million, one hundred one thousand, two hundred twenty".