1000021000221 has 8 divisors (see below), whose sum is σ = 1481512592960. Its totient is φ = 666680666796.

The previous prime is 1000021000219. The next prime is 1000021000241. The reversal of 1000021000221 is 1220001200001.

It is not a de Polignac number, because 1000021000221 - 2¹ = 1000021000219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000021000241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18518907385 + ... + 18518907438.

It is an arithmetic number, because the mean of its divisors is an integer number (185189074120).

Almost surely, 2^{1000021000221} is an apocalyptic number.

It is an amenable number.

1000021000221 is a deficient number, since it is larger than the sum of its proper divisors (481491592739).

1000021000221 is an equidigital number, since it uses as much as digits as its factorization.

1000021000221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37037814832 (or 37037814826 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 1000021000221 its reverse (1220001200001), we get a palindrome (2220022200222).

The spelling of 1000021000221 in words is "one trillion, twenty-one million, two hundred twenty-one", and thus it is an aban number.