21222032021 has 8 divisors (see below), whose sum is σ = 21799907640. Its totient is φ = 20644383168.

The previous prime is 21222032011. The next prime is 21222032077. The reversal of 21222032021 is 12023022212.

It can be written as a sum of positive squares in 4 ways, for example, as 48580900 + 21173451121 = 6970^2 + 145511^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21222032021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222032011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142415 + ... + 250451.

It is an arithmetic number, because the mean of its divisors is an integer number (2724988455).

Almost surely, 2^21222032021 is an apocalyptic number.

It is an amenable number.

21222032021 is a deficient number, since it is larger than the sum of its proper divisors (577875619).

21222032021 is a wasteful number, since it uses less digits than its factorization.

21222032021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113383.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21222032021 its reverse (12023022212), we get a palindrome (33245054233).

The spelling of 21222032021 in words is "twenty-one billion, two hundred twenty-two million, thirty-two thousand, twenty-one".