21616635234 has 16 divisors (see below), whose sum is σ = 44627892480. Its totient is φ = 6973108080.

The previous prime is 21616635233. The next prime is 21616635247. The reversal of 21616635234 is 43253661612.

It is a junction number, because it is equal to n+sod(n) for n = 21616635192 and 21616635201.

It is not an unprimeable number, because it can be changed into a prime (21616635233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58109049 + ... + 58109420.

It is an arithmetic number, because the mean of its divisors is an integer number (2789243280).

Almost surely, 2^21616635234 is an apocalyptic number.

21616635234 is an abundant number, since it is smaller than the sum of its proper divisors (23011257246).

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

21616635234 is a wasteful number, since it uses less digits than its factorization.

21616635234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116218505.

The product of its digits is 155520, while the sum is 39.

The spelling of 21616635234 in words is "twenty-one billion, six hundred sixteen million, six hundred thirty-five thousand, two hundred thirty-four".