21012000110001 has 12 divisors (see below), whose sum is σ = 31090926992580. Its totient is φ = 13666341534720.

The previous prime is 21012000109993. The next prime is 21012000110009. The reversal of 21012000110001 is 10001100021012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21012000109993) and next prime (21012000110009).

It can be written as a sum of positive squares in 2 ways, for example, as 4200368270400 + 16811631839601 = 2049480^2 + 4100199^2 .

It is not a de Polignac number, because 21012000110001 - 2³ = 21012000109993 is a prime.

It is a super-2 number, since 2×21012000110001² (a number of 27 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (21012000110009) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28471544496 + ... + 28471545233.

It is an arithmetic number, because the mean of its divisors is an integer number (2590910582715).

Almost surely, 2^{21012000110001} is an apocalyptic number.

It is an amenable number.

21012000110001 is a deficient number, since it is larger than the sum of its proper divisors (10078926882579).

21012000110001 is a wasteful number, since it uses less digits than its factorization.

21012000110001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56943089776 (or 56943089773 counting only the distinct ones).

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

Adding to 21012000110001 its reverse (10001100021012), we get a palindrome (31013100131013).

The spelling of 21012000110001 in words is "twenty-one trillion, twelve billion, one hundred ten thousand, one".