21400204312 has 32 divisors (see below), whose sum is σ = 41224619520. Its totient is φ = 10409700640.

The previous prime is 21400204297. The next prime is 21400204351. The reversal of 21400204312 is 21340200412.

It is a self number, because there is not a number n which added to its sum of digits gives 21400204312.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 107614 + ... + 233197.

It is an arithmetic number, because the mean of its divisors is an integer number (1288269360).

Almost surely, 2^21400204312 is an apocalyptic number.

It is an amenable number.

21400204312 is a deficient number, since it is larger than the sum of its proper divisors (19824415208).

21400204312 is a wasteful number, since it uses less digits than its factorization.

21400204312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341031 (or 341027 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21400204312 its reverse (21340200412), we get a palindrome (42740404724).

The spelling of 21400204312 in words is "twenty-one billion, four hundred million, two hundred four thousand, three hundred twelve".