20110221123 has 16 divisors (see below), whose sum is σ = 27621369600. Its totient is φ = 13007129184.

The previous prime is 20110221083. The next prime is 20110221127. The reversal of 20110221123 is 32112201102.

It is not a de Polignac number, because 20110221123 - 2⁶ = 20110221059 is a prime.

It is a super-2 number, since 2×20110221123² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20110221127) 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 15 ways as a sum of consecutive naturals, for example, 503911 + ... + 542352.

It is an arithmetic number, because the mean of its divisors is an integer number (1726335600).

Almost surely, 2^20110221123 is an apocalyptic number.

20110221123 is a deficient number, since it is larger than the sum of its proper divisors (7511148477).

20110221123 is a wasteful number, since it uses less digits than its factorization.

20110221123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1046458.

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

Adding to 20110221123 its reverse (32112201102), we get a palindrome (52222422225).

The spelling of 20110221123 in words is "twenty billion, one hundred ten million, two hundred twenty-one thousand, one hundred twenty-three".