21123220321130 has 16 divisors (see below), whose sum is σ = 38449007777160. Its totient is φ = 8354352306432.

The previous prime is 21123220321081. The next prime is 21123220321211. The reversal of 21123220321130 is 3112302232112.

It can be written as a sum of positive squares in 4 ways, for example, as 7347520418161 + 13775699902969 = 2710631^2 + 3711563^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21123220321096 and 21123220321105.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11866976819 + ... + 11866978598.

Almost surely, 2^{21123220321130} is an apocalyptic number.

21123220321130 is a deficient number, since it is larger than the sum of its proper divisors (17325787456030).

21123220321130 is a wasteful number, since it uses less digits than its factorization.

21123220321130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23733955513.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21123220321130 its reverse (3112302232112), we get a palindrome (24235522553242).

The spelling of 21123220321130 in words is "twenty-one trillion, one hundred twenty-three billion, two hundred twenty million, three hundred twenty-one thousand, one hundred thirty".