1000021220001 has 32 divisors (see below), whose sum is σ = 1493000087040. Its totient is φ = 661512805200.

The previous prime is 1000021219997. The next prime is 1000021220041. The reversal of 1000021220001 is 1000221200001.

It is not a de Polignac number, because 1000021220001 - 2² = 1000021219997 is a prime.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1000021220041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55886266 + ... + 55904156.

It is an arithmetic number, because the mean of its divisors is an integer number (46656252720).

Almost surely, 2^{1000021220001} is an apocalyptic number.

It is an amenable number.

1000021220001 is a deficient number, since it is larger than the sum of its proper divisors (492978867039).

1000021220001 is a wasteful number, since it uses less digits than its factorization.

1000021220001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33834 (or 33828 counting only the distinct ones).

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

Adding to 1000021220001 its reverse (1000221200001), we get a palindrome (2000242420002).

The spelling of 1000021220001 in words is "one trillion, twenty-one million, two hundred twenty thousand, one".