21120001101 has 8 divisors (see below), whose sum is σ = 31288890560. Its totient is φ = 14080000716.

The previous prime is 21120001093. The next prime is 21120001103. The reversal of 21120001101 is 10110002112.

It is a happy number.

It is not a de Polignac number, because 21120001101 - 2³ = 21120001093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120001103) 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, 391111105 + ... + 391111158.

It is an arithmetic number, because the mean of its divisors is an integer number (3911111320).

Almost surely, 2^21120001101 is an apocalyptic number.

It is an amenable number.

21120001101 is a deficient number, since it is larger than the sum of its proper divisors (10168889459).

21120001101 is an equidigital number, since it uses as much as digits as its factorization.

21120001101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782222272 (or 782222266 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 21120001101 its reverse (10110002112), we get a palindrome (31230003213).

The spelling of 21120001101 in words is "twenty-one billion, one hundred twenty million, one thousand, one hundred one".