21230022021 has 16 divisors (see below), whose sum is σ = 30490911360. Its totient is φ = 13061724480.

The previous prime is 21230022017. The next prime is 21230022053. The reversal of 21230022021 is 12022003212.

It is a happy number.

It is not a de Polignac number, because 21230022021 - 2² = 21230022017 is a prime.

It is a super-3 number, since 3×21230022021³ (a number of 32 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230022521) 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 15 ways as a sum of consecutive naturals, for example, 124311 + ... + 240651.

It is an arithmetic number, because the mean of its divisors is an integer number (1905681960).

Almost surely, 2^21230022021 is an apocalyptic number.

It is an amenable number.

21230022021 is a deficient number, since it is larger than the sum of its proper divisors (9260889339).

21230022021 is a wasteful number, since it uses less digits than its factorization.

21230022021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121036.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21230022021 its reverse (12022003212), we get a palindrome (33252025233).

The spelling of 21230022021 in words is "twenty-one billion, two hundred thirty million, twenty-two thousand, twenty-one".