21504311403402 has 8 divisors (see below), whose sum is σ = 43008622806816. Its totient is φ = 7168103801132.

The previous prime is 21504311403401. The next prime is 21504311403481. The reversal of 21504311403402 is 20430411340512.

It is a sphenic number, since it is the product of 3 distinct primes.

21504311403402 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 21504311403402.

It is not an unprimeable number, because it can be changed into a prime (21504311403401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1792025950278 + ... + 1792025950289.

It is an arithmetic number, because the mean of its divisors is an integer number (5376077850852).

Almost surely, 2^{21504311403402} is an apocalyptic number.

21504311403402 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21504311403402 is a wasteful number, since it uses less digits than its factorization.

21504311403402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3584051900572.

The product of its (nonzero) digits is 11520, while the sum is 30.

Adding to 21504311403402 its reverse (20430411340512), we get a palindrome (41934722743914).

The spelling of 21504311403402 in words is "twenty-one trillion, five hundred four billion, three hundred eleven million, four hundred three thousand, four hundred two".