21533104406 has 32 divisors (see below), whose sum is σ = 35788780800. Its totient is φ = 9634442400.

The previous prime is 21533104363. The next prime is 21533104427. The reversal of 21533104406 is 60440133512.

It is a super-2 number, since 2×21533104406² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent 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, 2278511 + ... + 2287941.

It is an arithmetic number, because the mean of its divisors is an integer number (1118399400).

Almost surely, 2^21533104406 is an apocalyptic number.

21533104406 is a deficient number, since it is larger than the sum of its proper divisors (14255676394).

21533104406 is a wasteful number, since it uses less digits than its factorization.

21533104406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11060.

The product of its (nonzero) digits is 8640, while the sum is 29.

Adding to 21533104406 its reverse (60440133512), we get a palindrome (81973237918).

The spelling of 21533104406 in words is "twenty-one billion, five hundred thirty-three million, one hundred four thousand, four hundred six".