21220000231 has 8 divisors (see below), whose sum is σ = 21258111744. Its totient is φ = 21181923840.

The previous prime is 21220000201. The next prime is 21220000259. The reversal of 21220000231 is 13200002212.

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 21220000231 - 2²³ = 21211611623 is a prime.

It is a super-2 number, since 2×21220000231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220000201) 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, 1394295 + ... + 1409431.

It is an arithmetic number, because the mean of its divisors is an integer number (2657263968).

Almost surely, 2^21220000231 is an apocalyptic number.

21220000231 is a deficient number, since it is larger than the sum of its proper divisors (38111513).

21220000231 is a wasteful number, since it uses less digits than its factorization.

21220000231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17561.

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 21220000231 its reverse (13200002212), we get a palindrome (34420002443).

The spelling of 21220000231 in words is "twenty-one billion, two hundred twenty million, two hundred thirty-one", and thus it is an aban number.