221021001200021 has 64 divisors (see below), whose sum is σ = 256371230269440. Its totient is φ = 188580566845440.

The previous prime is 221021001199981. The next prime is 221021001200023. The reversal of 221021001200021 is 120002100120122.

It is not a de Polignac number, because 221021001200021 - 2⁴⁶ = 150652257022357 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221021001199969 and 221021001200005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221021001200023) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10621403465 + ... + 10621424273.

It is an arithmetic number, because the mean of its divisors is an integer number (4005800472960).

Almost surely, 2^{221021001200021} is an apocalyptic number.

It is an amenable number.

221021001200021 is a deficient number, since it is larger than the sum of its proper divisors (35350229069419).

221021001200021 is a wasteful number, since it uses less digits than its factorization.

221021001200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24666.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 221021001200021 its reverse (120002100120122), we get a palindrome (341023101320143).

The spelling of 221021001200021 in words is "two hundred twenty-one trillion, twenty-one billion, one million, two hundred thousand, twenty-one".