21110123201 has 6 divisors (see below), whose sum is σ = 22424940870. Its totient is φ = 19868350976.

The previous prime is 21110123161. The next prime is 21110123213. The reversal of 21110123201 is 10232101112.

It can be written as a sum of positive squares in 3 ways, for example, as 14422809025 + 6687314176 = 120095^2 + 81776^2 .

It is not a de Polignac number, because 21110123201 - 2¹⁴ = 21110106817 is a prime.

It is a super-2 number, since 2×21110123201² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21110123401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36522416 + ... + 36522993.

It is an arithmetic number, because the mean of its divisors is an integer number (3737490145).

Almost surely, 2^21110123201 is an apocalyptic number.

It is an amenable number.

21110123201 is a deficient number, since it is larger than the sum of its proper divisors (1314817669).

21110123201 is an equidigital number, since it uses as much as digits as its factorization.

21110123201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73045443 (or 73045426 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21110123201 its reverse (10232101112), we get a palindrome (31342224313).

The spelling of 21110123201 in words is "twenty-one billion, one hundred ten million, one hundred twenty-three thousand, two hundred one".