21001011101 has 16 divisors (see below), whose sum is σ = 25351569408. Its totient is φ = 17015065200.

The previous prime is 21001011089. The next prime is 21001011127. The reversal of 21001011101 is 10111010012.

It is a happy number.

It is not a de Polignac number, because 21001011101 - 2¹⁰ = 21001010077 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 (21001011191) 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, 1116005 + ... + 1134666.

It is an arithmetic number, because the mean of its divisors is an integer number (1584473088).

Almost surely, 2^21001011101 is an apocalyptic number.

It is an amenable number.

21001011101 is a deficient number, since it is larger than the sum of its proper divisors (4350558307).

21001011101 is a wasteful number, since it uses less digits than its factorization.

21001011101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2250752.

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

Adding to 21001011101 its reverse (10111010012), we get a palindrome (31112021113).

The spelling of 21001011101 in words is "twenty-one billion, one million, eleven thousand, one hundred one".