21216416322522 has 64 divisors (see below), whose sum is σ = 43675465680000. Its totient is φ = 6866704158720.

The previous prime is 21216416322499. The next prime is 21216416322557. The reversal of 21216416322522 is 22522361461212.

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, 153440554 + ... + 153578762.

It is an arithmetic number, because the mean of its divisors is an integer number (682429151250).

Almost surely, 2^{21216416322522} is an apocalyptic number.

21216416322522 is an abundant number, since it is smaller than the sum of its proper divisors (22459049357478).

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

21216416322522 is a wasteful number, since it uses less digits than its factorization.

21216416322522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141231.

The product of its digits is 138240, while the sum is 39.

Adding to 21216416322522 its reverse (22522361461212), we get a palindrome (43738777783734).

The spelling of 21216416322522 in words is "twenty-one trillion, two hundred sixteen billion, four hundred sixteen million, three hundred twenty-two thousand, five hundred twenty-two".