21069017688 has 64 divisors (see below), whose sum is σ = 53458099200. Its totient is φ = 6918428160.

The previous prime is 21069017687. The next prime is 21069017689. The reversal of 21069017688 is 88671096012.

It is an interprime number because it is at equal distance from previous prime (21069017687) and next prime (21069017689).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21069017687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2420448 + ... + 2429136.

It is an arithmetic number, because the mean of its divisors is an integer number (835282800).

Almost surely, 2^21069017688 is an apocalyptic number.

It is an amenable number.

21069017688 is an abundant number, since it is smaller than the sum of its proper divisors (32389081512).

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

21069017688 is a wasteful number, since it uses less digits than its factorization.

21069017688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10192 (or 10188 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 48.

The spelling of 21069017688 in words is "twenty-one billion, sixty-nine million, seventeen thousand, six hundred eighty-eight".