21078529136 has 60 divisors (see below), whose sum is σ = 48612247992. Its totient is φ = 8823556224.

The previous prime is 21078529133. The next prime is 21078529151. The reversal of 21078529136 is 63192587012.

It is a super-3 number, since 3×21078529136³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21078529133) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 278915 + ... + 346338.

Almost surely, 2^21078529136 is an apocalyptic number.

It is an amenable number.

21078529136 is an abundant number, since it is smaller than the sum of its proper divisors (27533718856).

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

21078529136 is a wasteful number, since it uses less digits than its factorization.

21078529136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625318 (or 625305 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 44.

The spelling of 21078529136 in words is "twenty-one billion, seventy-eight million, five hundred twenty-nine thousand, one hundred thirty-six".