21012002130 has 96 divisors (see below), whose sum is σ = 61212703104. Its totient is φ = 4593921024.

The previous prime is 21012002117. The next prime is 21012002147. The reversal of 21012002130 is 3120021012.

It is a super-2 number, since 2×21012002130² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 276927 + ... + 344546.

It is an arithmetic number, because the mean of its divisors is an integer number (637632324).

Almost surely, 2^21012002130 is an apocalyptic number.

21012002130 is an abundant number, since it is smaller than the sum of its proper divisors (40200700974).

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

21012002130 is a wasteful number, since it uses less digits than its factorization.

21012002130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621520 (or 621513 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21012002130 its reverse (3120021012), we get a palindrome (24132023142).

The spelling of 21012002130 in words is "twenty-one billion, twelve million, two thousand, one hundred thirty".