21216404046343 has 32 divisors (see below), whose sum is σ = 24759200212992. Its totient is φ = 17985494841600.

The previous prime is 21216404046323. The next prime is 21216404046421. The reversal of 21216404046343 is 34364040461212.

It is not a de Polignac number, because 21216404046343 - 2¹⁷ = 21216403915271 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21216404046296 and 21216404046305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21216404046323) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 12994305 + ... + 14535637.

It is an arithmetic number, because the mean of its divisors is an integer number (773725006656).

Almost surely, 2^{21216404046343} is an apocalyptic number.

21216404046343 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21216404046343 is a deficient number, since it is larger than the sum of its proper divisors (3542796166649).

21216404046343 is a wasteful number, since it uses less digits than its factorization.

21216404046343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1542735.

The product of its (nonzero) digits is 331776, while the sum is 40.

The spelling of 21216404046343 in words is "twenty-one trillion, two hundred sixteen billion, four hundred four million, forty-six thousand, three hundred forty-three".