21011210101201 has 8 divisors (see below), whose sum is σ = 21089568959784. Its totient is φ = 20932922774400.

The previous prime is 21011210101169. The next prime is 21011210101207. The reversal of 21011210101201 is 10210101211012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3121144088976 + 17890066012225 = 1766676^2 + 4229665^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21011210101201 - 2⁵ = 21011210101169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21011210101207) 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, 17294350 + ... + 18469351.

It is an arithmetic number, because the mean of its divisors is an integer number (2636196119973).

Almost surely, 2^{21011210101201} is an apocalyptic number.

It is an amenable number.

21011210101201 is a deficient number, since it is larger than the sum of its proper divisors (78358858583).

21011210101201 is a wasteful number, since it uses less digits than its factorization.

21011210101201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35765891.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21011210101201 its reverse (10210101211012), we get a palindrome (31221311312213).

The spelling of 21011210101201 in words is "twenty-one trillion, eleven billion, two hundred ten million, one hundred one thousand, two hundred one".