21011001101 has 16 divisors (see below), whose sum is σ = 22356985728. Its totient is φ = 19703217600.

The previous prime is 21011001083. The next prime is 21011001127. The reversal of 21011001101 is 10110011012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21011001101 - 2¹⁴ = 21010984717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011001001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 406331 + ... + 455111.

It is an arithmetic number, because the mean of its divisors is an integer number (1397311608).

Almost surely, 2^21011001101 is an apocalyptic number.

It is an amenable number.

21011001101 is a deficient number, since it is larger than the sum of its proper divisors (1345984627).

21011001101 is a wasteful number, since it uses less digits than its factorization.

21011001101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49172.

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 21011001101 its reverse (10110011012), we get a palindrome (31121012113).

It can be divided in two parts, 2 and 1011001101, that multiplied together give a palindrome (2022002202).

The spelling of 21011001101 in words is "twenty-one billion, eleven million, one thousand, one hundred one".