221012021000 has 64 divisors (see below), whose sum is σ = 519876264960. Its totient is φ = 87941880000.

The previous prime is 221012020981. The next prime is 221012021033. The reversal of 221012021000 is 120210122.

It is a happy 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, 387566 + ... + 769565.

It is an arithmetic number, because the mean of its divisors is an integer number (8123066640).

Almost surely, 2^221012021000 is an apocalyptic number.

221012021000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221012021000 is an abundant number, since it is smaller than the sum of its proper divisors (298864243960).

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

221012021000 is a wasteful number, since it uses less digits than its factorization.

221012021000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1157343 (or 1157329 counting only the distinct ones).

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

Adding to 221012021000 its reverse (120210122), we get a palindrome (221132231122).

The spelling of 221012021000 in words is "two hundred twenty-one billion, twelve million, twenty-one thousand".