21796203855 has 16 divisors (see below), whose sum is σ = 35351652960. Its totient is φ = 11465399808.

The previous prime is 21796203841. The next prime is 21796203887. The reversal of 21796203855 is 55830269712.

It is not a de Polignac number, because 21796203855 - 2¹¹ = 21796201807 is a prime.

It is a super-2 number, since 2×21796203855² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 9951510 + ... + 9953699.

It is an arithmetic number, because the mean of its divisors is an integer number (2209478310).

Almost surely, 2^21796203855 is an apocalyptic number.

21796203855 is a deficient number, since it is larger than the sum of its proper divisors (13555449105).

21796203855 is a wasteful number, since it uses less digits than its factorization.

21796203855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19905290.

The product of its (nonzero) digits is 907200, while the sum is 48.

The spelling of 21796203855 in words is "twenty-one billion, seven hundred ninety-six million, two hundred three thousand, eight hundred fifty-five".