21220123011 has 8 divisors (see below), whose sum is σ = 28342535184. Its totient is φ = 14122229760.

The previous prime is 21220122977. The next prime is 21220123021. The reversal of 21220123011 is 11032102212.

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

It is not a de Polignac number, because 21220123011 - 2⁶ = 21220122947 is a prime.

It is a super-2 number, since 2×21220123011² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21220123021) 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, 6127710 + ... + 6131171.

It is an arithmetic number, because the mean of its divisors is an integer number (3542816898).

Almost surely, 2^21220123011 is an apocalyptic number.

21220123011 is a deficient number, since it is larger than the sum of its proper divisors (7122412173).

21220123011 is a wasteful number, since it uses less digits than its factorization.

21220123011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12259461.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21220123011 its reverse (11032102212), we get a palindrome (32252225223).

The spelling of 21220123011 in words is "twenty-one billion, two hundred twenty million, one hundred twenty-three thousand, eleven".