21221101307 has 8 divisors (see below), whose sum is σ = 24255577056. Its totient is φ = 18187348032.

The previous prime is 21221101289. The next prime is 21221101313. The reversal of 21221101307 is 70310112212.

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

It is not a de Polignac number, because 21221101307 - 2¹⁰ = 21221100283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21221101357) 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, 116138 + ... + 236495.

It is an arithmetic number, because the mean of its divisors is an integer number (3031947132).

Almost surely, 2^21221101307 is an apocalyptic number.

21221101307 is a deficient number, since it is larger than the sum of its proper divisors (3034475749).

21221101307 is an equidigital number, since it uses as much as digits as its factorization.

21221101307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361237.

The product of its (nonzero) digits is 168, while the sum is 20.

Adding to 21221101307 its reverse (70310112212), we get a palindrome (91531213519).

The spelling of 21221101307 in words is "twenty-one billion, two hundred twenty-one million, one hundred one thousand, three hundred seven".