21329686036 has 24 divisors (see below), whose sum is σ = 37507579200. Its totient is φ = 10613332800.

The previous prime is 21329686033. The next prime is 21329686051. The reversal of 21329686036 is 63068692312.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21329686033) 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, 899865 + ... + 923263.

It is an arithmetic number, because the mean of its divisors is an integer number (1562815800).

Almost surely, 2^21329686036 is an apocalyptic number.

It is an amenable number.

21329686036 is a deficient number, since it is larger than the sum of its proper divisors (16177893164).

21329686036 is a wasteful number, since it uses less digits than its factorization.

21329686036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24495 (or 24493 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 46.

The spelling of 21329686036 in words is "twenty-one billion, three hundred twenty-nine million, six hundred eighty-six thousand, thirty-six".