21230002012 has 24 divisors (see below), whose sum is σ = 37501684416. Its totient is φ = 10515337728.

The previous prime is 21230002009. The next prime is 21230002019. The reversal of 21230002012 is 21020003212.

It is a junction number, because it is equal to n+sod(n) for n = 21230001983 and 21230002001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230002019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 889053 + ... + 912619.

It is an arithmetic number, because the mean of its divisors is an integer number (1562570184).

Almost surely, 2^21230002012 is an apocalyptic number.

It is an amenable number.

21230002012 is a deficient number, since it is larger than the sum of its proper divisors (16271682404).

21230002012 is a wasteful number, since it uses less digits than its factorization.

21230002012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25677 (or 25675 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 21230002012 its reverse (21020003212), we get a palindrome (42250005224).

The spelling of 21230002012 in words is "twenty-one billion, two hundred thirty million, two thousand, twelve".