21123210130 has 32 divisors (see below), whose sum is σ = 41881027968. Its totient is φ = 7606588800.

The previous prime is 21123210109. The next prime is 21123210137. The reversal of 21123210130 is 3101232112.

It is a super-2 number, since 2×21123210130² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21123210137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 920851 + ... + 943510.

It is an arithmetic number, because the mean of its divisors is an integer number (1308782124).

Almost surely, 2^21123210130 is an apocalyptic number.

21123210130 is a deficient number, since it is larger than the sum of its proper divisors (20757817838).

21123210130 is a wasteful number, since it uses less digits than its factorization.

21123210130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1864482.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21123210130 its reverse (3101232112), we get a palindrome (24224442242).

The spelling of 21123210130 in words is "twenty-one billion, one hundred twenty-three million, two hundred ten thousand, one hundred thirty".