21220010231 has 8 divisors (see below), whose sum is σ = 24255444864. Its totient is φ = 18185576760.

The previous prime is 21220010177. The next prime is 21220010233. The reversal of 21220010231 is 13201002212.

It is a happy number.

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 21220010231 - 2²² = 21215815927 is a prime.

It is a super-2 number, since 2×21220010231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220010233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 204305 + ... + 290138.

It is an arithmetic number, because the mean of its divisors is an integer number (3031930608).

Almost surely, 2^21220010231 is an apocalyptic number.

21220010231 is a deficient number, since it is larger than the sum of its proper divisors (3035434633).

21220010231 is an equidigital number, since it uses as much as digits as its factorization.

21220010231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500581.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21220010231 its reverse (13201002212), we get a palindrome (34421012443).

The spelling of 21220010231 in words is "twenty-one billion, two hundred twenty million, ten thousand, two hundred thirty-one".