21216054510364 has 48 divisors (see below), whose sum is σ = 44928791328960. Its totient is φ = 8557607531520.

The previous prime is 21216054510323. The next prime is 21216054510367. The reversal of 21216054510364 is 46301545061212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21216054510367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35316942 + ... + 35912650.

It is an arithmetic number, because the mean of its divisors is an integer number (936016486020).

Almost surely, 2^{21216054510364} is an apocalyptic number.

It is an amenable number.

21216054510364 is an abundant number, since it is smaller than the sum of its proper divisors (23712736818596).

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

21216054510364 is a wasteful number, since it uses less digits than its factorization.

21216054510364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670558 (or 670556 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 40.

Adding to 21216054510364 its reverse (46301545061212), we get a palindrome (67517599571576).

The spelling of 21216054510364 in words is "twenty-one trillion, two hundred sixteen billion, fifty-four million, five hundred ten thousand, three hundred sixty-four".