21220010123 has 32 divisors (see below), whose sum is σ = 24095957760. Its totient is φ = 18550224000.

The previous prime is 21220010107. The next prime is 21220010137. The reversal of 21220010123 is 32101002212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21220010123 - 2⁴ = 21220010107 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21220010098 and 21220010107.

It is not an unprimeable number, because it can be changed into a prime (21220010173) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6338336 + ... + 6341682.

It is an arithmetic number, because the mean of its divisors is an integer number (752998680).

Almost surely, 2^21220010123 is an apocalyptic number.

21220010123 is a deficient number, since it is larger than the sum of its proper divisors (2875947637).

21220010123 is a wasteful number, since it uses less digits than its factorization.

21220010123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3707.

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

Adding to 21220010123 its reverse (32101002212), we get a palindrome (53321012335).

The spelling of 21220010123 in words is "twenty-one billion, two hundred twenty million, ten thousand, one hundred twenty-three".