21310101100 has 36 divisors (see below), whose sum is σ = 46700792208. Its totient is φ = 8439640000.

The previous prime is 21310101091. The next prime is 21310101101. The reversal of 21310101100 is 110101312.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (21310101101) by changing a digit.

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, 1044856 + ... + 1065055.

It is an arithmetic number, because the mean of its divisors is an integer number (1297244228).

Almost surely, 2^21310101100 is an apocalyptic number.

21310101100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21310101100 is an abundant number, since it is smaller than the sum of its proper divisors (25390691108).

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

21310101100 is a wasteful number, since it uses less digits than its factorization.

21310101100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2110026 (or 2110019 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 10.

Adding to 21310101100 its reverse (110101312), we get a palindrome (21420202412).

The spelling of 21310101100 in words is "twenty-one billion, three hundred ten million, one hundred one thousand, one hundred".