21120220023 has 16 divisors (see below), whose sum is σ = 32190412800. Its totient is φ = 12065989536.

The previous prime is 21120219983. The next prime is 21120220039. The reversal of 21120220023 is 32002202112.

It is a happy number.

It is not a de Polignac number, because 21120220023 - 2¹² = 21120215927 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21120219984 and 21120220011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120220063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15015 + ... + 206072.

It is an arithmetic number, because the mean of its divisors is an integer number (2011900800).

Almost surely, 2^21120220023 is an apocalyptic number.

21120220023 is a deficient number, since it is larger than the sum of its proper divisors (11070192777).

21120220023 is a wasteful number, since it uses less digits than its factorization.

21120220023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225646.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21120220023 its reverse (32002202112), we get a palindrome (53122422135).

The spelling of 21120220023 in words is "twenty-one billion, one hundred twenty million, two hundred twenty thousand, twenty-three".