21031210130 has 144 divisors (see below), whose sum is σ = 45680967360. Its totient is φ = 6950470464.

The previous prime is 21031210121. The next prime is 21031210139. The reversal of 21031210130 is 3101213012.

It is an interprime number because it is at equal distance from previous prime (21031210121) and next prime (21031210139).

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21031210139) 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 71 ways as a sum of consecutive naturals, for example, 125935307 + ... + 125935473.

It is an arithmetic number, because the mean of its divisors is an integer number (317228940).

Almost surely, 2^21031210130 is an apocalyptic number.

21031210130 is an abundant number, since it is smaller than the sum of its proper divisors (24649757230).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21031210130 is a wasteful number, since it uses less digits than its factorization.

21031210130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413 (or 363 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21031210130 its reverse (3101213012), we get a palindrome (24132423142).

The spelling of 21031210130 in words is "twenty-one billion, thirty-one million, two hundred ten thousand, one hundred thirty".