221012001020 has 48 divisors (see below), whose sum is σ = 490316806560. Its totient is φ = 83449522944.

The previous prime is 221012000939. The next prime is 221012001037. The reversal of 221012001020 is 20100210122.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 221012000992 and 221012001010.

It is a congruent number.

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, 944579 + ... + 1155098.

It is an arithmetic number, because the mean of its divisors is an integer number (10214933470).

Almost surely, 2^221012001020 is an apocalyptic number.

221012001020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221012001020 is an abundant number, since it is smaller than the sum of its proper divisors (269304805540).

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

221012001020 is a wasteful number, since it uses less digits than its factorization.

221012001020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2099982 (or 2099980 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 221012001020 its reverse (20100210122), we get a palindrome (241112211142).

The spelling of 221012001020 in words is "two hundred twenty-one billion, twelve million, one thousand, twenty".