21216403264354 has 64 divisors (see below), whose sum is σ = 33871001472000. Its totient is φ = 9953165234880.

The previous prime is 21216403264349. The next prime is 21216403264369. The reversal of 21216403264354 is 45346230461212.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a self number, because there is not a number n which added to its sum of digits gives 21216403264354.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 395868099 + ... + 395921689.

It is an arithmetic number, because the mean of its divisors is an integer number (529234398000).

Almost surely, 2^{21216403264354} is an apocalyptic number.

21216403264354 is a deficient number, since it is larger than the sum of its proper divisors (12654598207646).

21216403264354 is a wasteful number, since it uses less digits than its factorization.

21216403264354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55255.

The product of its (nonzero) digits is 829440, while the sum is 43.

The spelling of 21216403264354 in words is "twenty-one trillion, two hundred sixteen billion, four hundred three million, two hundred sixty-four thousand, three hundred fifty-four".