21464501138 has 16 divisors (see below), whose sum is σ = 34922160504. Its totient is φ = 9854576640.

The previous prime is 21464501131. The next prime is 21464501141. The reversal of 21464501138 is 83110546412.

It can be written as a sum of positive squares in 4 ways, for example, as 21078103489 + 386397649 = 145183^2 + 19657^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21464501098 and 21464501107.

It is not an unprimeable number, because it can be changed into a prime (21464501131) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 7697495 + ... + 7700282.

Almost surely, 2^21464501138 is an apocalyptic number.

21464501138 is a deficient number, since it is larger than the sum of its proper divisors (13457659366).

21464501138 is a wasteful number, since it uses less digits than its factorization.

21464501138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15397837.

The product of its (nonzero) digits is 23040, while the sum is 35.

The spelling of 21464501138 in words is "twenty-one billion, four hundred sixty-four million, five hundred one thousand, one hundred thirty-eight".