21013021101 has 16 divisors (see below), whose sum is σ = 29644783040. Its totient is φ = 13202611200.

The previous prime is 21013021091. The next prime is 21013021109. The reversal of 21013021101 is 10112031012.

It is a de Polignac number, because none of the positive numbers 2^k-21013021101 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013021109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 944050 + ... + 966051.

It is an arithmetic number, because the mean of its divisors is an integer number (1852798940).

Almost surely, 2^21013021101 is an apocalyptic number.

It is an amenable number.

21013021101 is a deficient number, since it is larger than the sum of its proper divisors (8631761939).

21013021101 is a wasteful number, since it uses less digits than its factorization.

21013021101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1910316.

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

Adding to 21013021101 its reverse (10112031012), we get a palindrome (31125052113).

The spelling of 21013021101 in words is "twenty-one billion, thirteen million, twenty-one thousand, one hundred one".