21616216554354 has 16 divisors (see below), whose sum is σ = 43232683592448. Its totient is φ = 7205363770832.

The previous prime is 21616216554329. The next prime is 21616216554367. The reversal of 21616216554354 is 45345561261612.

It is a junction number, because it is equal to n+sod(n) for n = 21616216554297 and 21616216554306.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9305517 + ... + 11394080.

It is an arithmetic number, because the mean of its divisors is an integer number (2702042724528).

Almost surely, 2^{21616216554354} is an apocalyptic number.

21616216554354 is an abundant number, since it is smaller than the sum of its proper divisors (21616467038094).

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

21616216554354 is a wasteful number, since it uses less digits than its factorization.

21616216554354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20873649.

The product of its digits is 5184000, while the sum is 51.

The spelling of 21616216554354 in words is "twenty-one trillion, six hundred sixteen billion, two hundred sixteen million, five hundred fifty-four thousand, three hundred fifty-four".