21003362406 has 24 divisors (see below), whose sum is σ = 49007846160. Its totient is φ = 6462572976.

The previous prime is 21003362381. The next prime is 21003362411. The reversal of 21003362406 is 60426330012.

21003362406 is a `hidden beast` number, since 2 + 1 + 0 + 0 + 33 + 624 + 0 + 6 = 666.

It is a super-2 number, since 2×21003362406² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21003362406.

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, 44878746 + ... + 44879213.

It is an arithmetic number, because the mean of its divisors is an integer number (2041993590).

Almost surely, 2^21003362406 is an apocalyptic number.

21003362406 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21003362406 is an abundant number, since it is smaller than the sum of its proper divisors (28004483754).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21003362406 is a wasteful number, since it uses less digits than its factorization.

21003362406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89757980 (or 89757977 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

Adding to 21003362406 its reverse (60426330012), we get a palindrome (81429692418).

The spelling of 21003362406 in words is "twenty-one billion, three million, three hundred sixty-two thousand, four hundred six".