21400243004 has 48 divisors (see below), whose sum is σ = 45328055808. Its totient is φ = 8641816128.

The previous prime is 21400243003. The next prime is 21400243013. The reversal of 21400243004 is 40034200412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21400243003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204839 + ... + 291134.

It is an arithmetic number, because the mean of its divisors is an integer number (944334496).

Almost surely, 2^21400243004 is an apocalyptic number.

It is an amenable number.

21400243004 is an abundant number, since it is smaller than the sum of its proper divisors (23927812804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21400243004 is a wasteful number, since it uses less digits than its factorization.

21400243004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496074 (or 496072 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 21400243004 its reverse (40034200412), we get a palindrome (61434443416).

The spelling of 21400243004 in words is "twenty-one billion, four hundred million, two hundred forty-three thousand, four".