21616222321354 has 8 divisors (see below), whose sum is σ = 32630857899588. Its totient is φ = 10739269688160.

The previous prime is 21616222321249. The next prime is 21616222321363. The reversal of 21616222321354 is 45312322261612.

It can be written as a sum of positive squares in 2 ways, for example, as 21137254515729 + 478967805625 = 4597527^2 + 692075^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21616222321354² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34420735867 + ... + 34420736494.

Almost surely, 2^{21616222321354} is an apocalyptic number.

21616222321354 is a deficient number, since it is larger than the sum of its proper divisors (11014635578234).

21616222321354 is a wasteful number, since it uses less digits than its factorization.

21616222321354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68841472520.

The product of its digits is 207360, while the sum is 40.

Adding to 21616222321354 its reverse (45312322261612), we get a palindrome (66928544582966).

The spelling of 21616222321354 in words is "twenty-one trillion, six hundred sixteen billion, two hundred twenty-two million, three hundred twenty-one thousand, three hundred fifty-four".