1021320221000 has 64 divisors (see below), whose sum is σ = 2493797604480. Its totient is φ = 390765988800.

The previous prime is 1021320220981. The next prime is 1021320221083. The reversal of 1021320221000 is 1220231201.

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, 22179614 + ... + 22225613.

It is an arithmetic number, because the mean of its divisors is an integer number (38965587570).

Almost surely, 2^{1021320221000} is an apocalyptic number.

1021320221000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021320221000 is an abundant number, since it is smaller than the sum of its proper divisors (1472477383480).

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

1021320221000 is a wasteful number, since it uses less digits than its factorization.

1021320221000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44405271 (or 44405257 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 1021320221000 its reverse (1220231201), we get a palindrome (1022540452201).

The spelling of 1021320221000 in words is "one trillion, twenty-one billion, three hundred twenty million, two hundred twenty-one thousand".