21118483684 has 9 divisors (see below), whose sum is σ = 36957855081. Its totient is φ = 10559096520.

The previous prime is 21118483663. The next prime is 21118483703. The reversal of 21118483684 is 48638481112.

The square root of 21118483684 is 145322.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 965842084 + 20152641600 = 31078^2 + 141960^2 .

It is a super-2 number, since 2×21118483684² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 254314 + ... + 326974.

Almost surely, 2^21118483684 is an apocalyptic number.

21118483684 is the 145322-nd square number.

It is an amenable number.

21118483684 is a deficient number, since it is larger than the sum of its proper divisors (15839371397).

21118483684 is an frugal number, since it uses more digits than its factorization.

21118483684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145326 (or 72663 counting only the distinct ones).

The product of its digits is 294912, while the sum is 46.

The spelling of 21118483684 in words is "twenty-one billion, one hundred eighteen million, four hundred eighty-three thousand, six hundred eighty-four".