21230213012 has 12 divisors (see below), whose sum is σ = 38016893376. Its totient is φ = 10368243480.

The previous prime is 21230213009. The next prime is 21230213023. The reversal of 21230213012 is 21031203212.

It is a super-2 number, since 2×21230213012² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61715564 + ... + 61715907.

It is an arithmetic number, because the mean of its divisors is an integer number (3168074448).

Almost surely, 2^21230213012 is an apocalyptic number.

It is an amenable number.

21230213012 is a deficient number, since it is larger than the sum of its proper divisors (16786680364).

21230213012 is a wasteful number, since it uses less digits than its factorization.

21230213012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123431518 (or 123431516 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21230213012 its reverse (21031203212), we get a palindrome (42261416224).

The spelling of 21230213012 in words is "twenty-one billion, two hundred thirty million, two hundred thirteen thousand, twelve".