221012111020 has 24 divisors (see below), whose sum is σ = 464572180800. Its totient is φ = 88319749632.

The previous prime is 221012110829. The next prime is 221012111039. The reversal of 221012111020 is 20111210122.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5297125 + ... + 5338684.

It is an arithmetic number, because the mean of its divisors is an integer number (19357174200).

Almost surely, 2^221012111020 is an apocalyptic number.

221012111020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221012111020 is an abundant number, since it is smaller than the sum of its proper divisors (243560069780).

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

221012111020 is a wasteful number, since it uses less digits than its factorization.

221012111020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10636857 (or 10636855 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 221012111020 its reverse (20111210122), we get a palindrome (241123321142).

The spelling of 221012111020 in words is "two hundred twenty-one billion, twelve million, one hundred eleven thousand, twenty".