21369765016 has 8 divisors (see below), whose sum is σ = 40068309420. Its totient is φ = 10684882504.

The previous prime is 21369765007. The next prime is 21369765019. The reversal of 21369765016 is 61056796312.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-3 number, since 3×21369765016³ (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 (21369765019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1335610306 + ... + 1335610321.

Almost surely, 2^21369765016 is an apocalyptic number.

It is an amenable number.

21369765016 is a deficient number, since it is larger than the sum of its proper divisors (18698544404).

21369765016 is a wasteful number, since it uses less digits than its factorization.

21369765016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2671220633 (or 2671220629 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 46.

The spelling of 21369765016 in words is "twenty-one billion, three hundred sixty-nine million, seven hundred sixty-five thousand, sixteen".