21869769800 has 36 divisors (see below), whose sum is σ = 50852077755. Its totient is φ = 8747071360.

The previous prime is 21869769793. The next prime is 21869769827. The reversal of 21869769800 is 896796812.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 5 ways, for example, as 17626810756 + 4242959044 = 132766^2 + 65138^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=104570.

It is a super-2 number, since 2×21869769800² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2086172 + ... + 2096628.

Almost surely, 2^21869769800 is an apocalyptic number.

21869769800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21869769800 is an abundant number, since it is smaller than the sum of its proper divisors (28982307955).

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

21869769800 is an frugal number, since it uses more digits than its factorization.

21869769800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20930 (or 10464 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 56.

The spelling of 21869769800 in words is "twenty-one billion, eight hundred sixty-nine million, seven hundred sixty-nine thousand, eight hundred".