21064634316 has 144 divisors (see below), whose sum is σ = 61501789440. Its totient is φ = 6011936640.

The previous prime is 21064634257. The next prime is 21064634321. The reversal of 21064634316 is 61343646012.

21064634316 is a `hidden beast` number, since 2 + 1 + 0 + 6 + 4 + 634 + 3 + 16 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1293561 + ... + 1309743.

It is an arithmetic number, because the mean of its divisors is an integer number (427095760).

Almost surely, 2^21064634316 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21064634316, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30750894720).

21064634316 is an abundant number, since it is smaller than the sum of its proper divisors (40437155124).

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

21064634316 is a wasteful number, since it uses less digits than its factorization.

21064634316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16396 (or 16391 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The spelling of 21064634316 in words is "twenty-one billion, sixty-four million, six hundred thirty-four thousand, three hundred sixteen".