21004103400 has 96 divisors (see below), whose sum is σ = 74414552640. Its totient is φ = 4800936960.

The previous prime is 21004103371. The next prime is 21004103429. The reversal of 21004103400 is 430140012.

It is an interprime number because it is at equal distance from previous prime (21004103371) and next prime (21004103429).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21004103400.

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 23 ways as a sum of consecutive naturals, for example, 2496289 + ... + 2504688.

It is an arithmetic number, because the mean of its divisors is an integer number (775151590).

Almost surely, 2^21004103400 is an apocalyptic number.

21004103400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21004103400 is an abundant number, since it is smaller than the sum of its proper divisors (53410449240).

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

21004103400 is a wasteful number, since it uses less digits than its factorization.

21004103400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5001003 (or 5000994 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21004103400 its reverse (430140012), we get a palindrome (21434243412).

The spelling of 21004103400 in words is "twenty-one billion, four million, one hundred three thousand, four hundred".