21403232012 has 12 divisors (see below), whose sum is σ = 37983200976. Its totient is φ = 10550888880.

The previous prime is 21403232003. The next prime is 21403232023. The reversal of 21403232012 is 21023230412.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37681463 + ... + 37682030.

It is an arithmetic number, because the mean of its divisors is an integer number (3165266748).

Almost surely, 2^21403232012 is an apocalyptic number.

It is an amenable number.

21403232012 is a deficient number, since it is larger than the sum of its proper divisors (16579968964).

21403232012 is a wasteful number, since it uses less digits than its factorization.

21403232012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75363568 (or 75363566 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21403232012 its reverse (21023230412), we get a palindrome (42426462424).

The spelling of 21403232012 in words is "twenty-one billion, four hundred three million, two hundred thirty-two thousand, twelve".