21548101100 has 36 divisors (see below), whose sum is σ = 46924668504. Its totient is φ = 8588772480.

The previous prime is 21548101093. The next prime is 21548101111. The reversal of 21548101100 is 110184512.

It is a super-2 number, since 2×21548101100² (a number of 21 digits) contains 22 as substring.

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 11 ways as a sum of consecutive naturals, for example, 352409 + ... + 409008.

It is an arithmetic number, because the mean of its divisors is an integer number (1303463014).

Almost surely, 2^21548101100 is an apocalyptic number.

21548101100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21548101100 is an abundant number, since it is smaller than the sum of its proper divisors (25376567404).

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

21548101100 is a wasteful number, since it uses less digits than its factorization.

21548101100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 761714 (or 761707 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 23.

Adding to 21548101100 its reverse (110184512), we get a palindrome (21658285612).

The spelling of 21548101100 in words is "twenty-one billion, five hundred forty-eight million, one hundred one thousand, one hundred".