12400021205 has 32 divisors (see below), whose sum is σ = 18401523840. Its totient is φ = 7886350080.

The previous prime is 12400021189. The next prime is 12400021217. The reversal of 12400021205 is 50212000421.

It is not a de Polignac number, because 12400021205 - 2⁴ = 12400021189 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 442802 + ... + 469971.

It is an arithmetic number, because the mean of its divisors is an integer number (575047620).

Almost surely, 2^12400021205 is an apocalyptic number.

It is an amenable number.

12400021205 is a deficient number, since it is larger than the sum of its proper divisors (6001502635).

12400021205 is a wasteful number, since it uses less digits than its factorization.

12400021205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 912821.

The product of its (nonzero) digits is 160, while the sum is 17.

Adding to 12400021205 its reverse (50212000421), we get a palindrome (62612021626).

The spelling of 12400021205 in words is "twelve billion, four hundred million, twenty-one thousand, two hundred five".