221002222021 has 16 divisors (see below), whose sum is σ = 257750006400. Its totient is φ = 189414697920.

The previous prime is 221002221991. The next prime is 221002222069. The reversal of 221002222021 is 120222200122.

It is not a de Polignac number, because 221002222021 - 2¹³ = 221002213829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221002221986 and 221002222004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221002222421) 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, 6201165 + ... + 6236701.

It is an arithmetic number, because the mean of its divisors is an integer number (16109375400).

Almost surely, 2^221002222021 is an apocalyptic number.

It is an amenable number.

221002222021 is a deficient number, since it is larger than the sum of its proper divisors (36747784379).

221002222021 is an equidigital number, since it uses as much as digits as its factorization.

221002222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53689 (or 53675 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 221002222021 its reverse (120222200122), we get a palindrome (341224422143).

The spelling of 221002222021 in words is "two hundred twenty-one billion, two million, two hundred twenty-two thousand, twenty-one".