21000001101 has 8 divisors (see below), whose sum is σ = 28965518880. Its totient is φ = 13517242032.

The previous prime is 21000001091. The next prime is 21000001153. The reversal of 21000001101 is 10110000012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21000001101 - 2⁵ = 21000001069 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21000001101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000001201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120689575 + ... + 120689748.

It is an arithmetic number, because the mean of its divisors is an integer number (3620689860).

Almost surely, 2^21000001101 is an apocalyptic number.

It is an amenable number.

21000001101 is a deficient number, since it is larger than the sum of its proper divisors (7965517779).

21000001101 is a wasteful number, since it uses less digits than its factorization.

21000001101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241379355.

The product of its (nonzero) digits is 2, while the sum is 6.

Adding to 21000001101 its reverse (10110000012), we get a palindrome (31110001113).

The spelling of 21000001101 in words is "twenty-one billion, one thousand, one hundred one".