221002121021 has 8 divisors (see below), whose sum is σ = 241129992288. Its totient is φ = 200880378000.

The previous prime is 221002120991. The next prime is 221002121047. The reversal of 221002121021 is 120121200122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221002121021 - 2³⁴ = 203822251837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221002120987 and 221002121005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221002121071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1456490 + ... + 1601051.

It is an arithmetic number, because the mean of its divisors is an integer number (30141249036).

Almost surely, 2^221002121021 is an apocalyptic number.

It is an amenable number.

221002121021 is a deficient number, since it is larger than the sum of its proper divisors (20127871267).

221002121021 is a wasteful number, since it uses less digits than its factorization.

221002121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3064123.

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

Adding to 221002121021 its reverse (120121200122), we get a palindrome (341123321143).

The spelling of 221002121021 in words is "two hundred twenty-one billion, two million, one hundred twenty-one thousand, twenty-one".