21479011490 has 32 divisors (see below), whose sum is σ = 38898992880. Its totient is φ = 8539121664.

The previous prime is 21479011441. The next prime is 21479011513. The reversal of 21479011490 is 9411097412.

It can be written as a sum of positive squares in 8 ways, for example, as 19438772929 + 2040238561 = 139423^2 + 45169^2 .

It is a super-2 number, since 2×21479011490² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1350062 + ... + 1365878.

Almost surely, 2^21479011490 is an apocalyptic number.

21479011490 is a deficient number, since it is larger than the sum of its proper divisors (17419981390).

21479011490 is a wasteful number, since it uses less digits than its factorization.

21479011490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16646.

The product of its (nonzero) digits is 18144, while the sum is 38.

The spelling of 21479011490 in words is "twenty-one billion, four hundred seventy-nine million, eleven thousand, four hundred ninety".