21002222021 has 8 divisors (see below), whose sum is σ = 22973948544. Its totient is φ = 19040901120.

The previous prime is 21002222011. The next prime is 21002222089. The reversal of 21002222021 is 12022220012.

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 21002222021 - 2¹⁰ = 21002220997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21002221987 and 21002222005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002222011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2597180 + ... + 2605253.

It is an arithmetic number, because the mean of its divisors is an integer number (2871743568).

Almost surely, 2^21002222021 is an apocalyptic number.

It is an amenable number.

21002222021 is a deficient number, since it is larger than the sum of its proper divisors (1971726523).

21002222021 is a wasteful number, since it uses less digits than its factorization.

21002222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5202811.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21002222021 its reverse (12022220012), we get a palindrome (33024442033).

The spelling of 21002222021 in words is "twenty-one billion, two million, two hundred twenty-two thousand, twenty-one".