21130021101 has 64 divisors (see below), whose sum is σ = 33108590592. Its totient is φ = 11739000000.

The previous prime is 21130021091. The next prime is 21130021139. The reversal of 21130021101 is 10112003112.

It is not a de Polignac number, because 21130021101 - 2⁶ = 21130021037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21130021181) 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 63 ways as a sum of consecutive naturals, for example, 49025356 + ... + 49025786.

It is an arithmetic number, because the mean of its divisors is an integer number (517321728).

Almost surely, 2^21130021101 is an apocalyptic number.

21130021101 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21130021101 is a deficient number, since it is larger than the sum of its proper divisors (11978569491).

21130021101 is a wasteful number, since it uses less digits than its factorization.

21130021101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 894.

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 21130021101 its reverse (10112003112), we get a palindrome (31242024213).

The spelling of 21130021101 in words is "twenty-one billion, one hundred thirty million, twenty-one thousand, one hundred one".