21612067384 has 48 divisors (see below), whose sum is σ = 41952065400. Its totient is φ = 10437456960.

The previous prime is 21612067349. The next prime is 21612067403. The reversal of 21612067384 is 48376021612.

It is a super-2 number, since 2×21612067384² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4510462 + ... + 4515250.

Almost surely, 2^21612067384 is an apocalyptic number.

It is an amenable number.

21612067384 is a deficient number, since it is larger than the sum of its proper divisors (20339998016).

21612067384 is a wasteful number, since it uses less digits than its factorization.

21612067384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5444 (or 5409 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 40.

Adding to 21612067384 its reverse (48376021612), we get a palindrome (69988088996).

The spelling of 21612067384 in words is "twenty-one billion, six hundred twelve million, sixty-seven thousand, three hundred eighty-four".