1001002221021 has 16 divisors (see below), whose sum is σ = 1460596315968. Its totient is φ = 604754227200.

The previous prime is 1001002220987. The next prime is 1001002221029. The reversal of 1001002221021 is 1201222001001.

It is not a de Polignac number, because 1001002221021 - 2⁹ = 1001002220509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1001002220988 and 1001002221006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001002221029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47834020 + ... + 47854941.

It is an arithmetic number, because the mean of its divisors is an integer number (91287269748).

Almost surely, 2^{1001002221021} is an apocalyptic number.

1001002221021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1001002221021 is a deficient number, since it is larger than the sum of its proper divisors (459594094947).

1001002221021 is a wasteful number, since it uses less digits than its factorization.

1001002221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95689292.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1001002221021 its reverse (1201222001001), we get a palindrome (2202224222022).

The spelling of 1001002221021 in words is "one trillion, one billion, two million, two hundred twenty-one thousand, twenty-one".