21012030130 has 64 divisors (see below), whose sum is σ = 47244637440. Its totient is φ = 6550689024.

The previous prime is 21012030119. The next prime is 21012030133. The reversal of 21012030130 is 3103021012.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a self number, because there is not a number n which added to its sum of digits gives 21012030130.

It is not an unprimeable number, because it can be changed into a prime (21012030133) 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, 111345 + ... + 233284.

It is an arithmetic number, because the mean of its divisors is an integer number (738197460).

Almost surely, 2^21012030130 is an apocalyptic number.

21012030130 is an abundant number, since it is smaller than the sum of its proper divisors (26232607310).

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

21012030130 is a wasteful number, since it uses less digits than its factorization.

21012030130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344723.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 21012030130 its reverse (3103021012), we get a palindrome (24115051142).

The spelling of 21012030130 in words is "twenty-one billion, twelve million, thirty thousand, one hundred thirty".