21037819064 has 16 divisors (see below), whose sum is σ = 39464196720. Its totient is φ = 10514033280.

The previous prime is 21037819057. The next prime is 21037819091. The reversal of 21037819064 is 46091873012.

It is a super-3 number, since 3×21037819064³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 591164 + ... + 625739.

It is an arithmetic number, because the mean of its divisors is an integer number (2466512295).

Almost surely, 2^21037819064 is an apocalyptic number.

It is an amenable number.

21037819064 is a deficient number, since it is larger than the sum of its proper divisors (18426377656).

21037819064 is a wasteful number, since it uses less digits than its factorization.

21037819064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1219070 (or 1219066 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 41.

The spelling of 21037819064 in words is "twenty-one billion, thirty-seven million, eight hundred nineteen thousand, sixty-four".