21011211012201 has 64 divisors (see below), whose sum is σ = 30161133250560. Its totient is φ = 12963826810880.

The previous prime is 21011211012089. The next prime is 21011211012289. The reversal of 21011211012201 is 10221011211012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21011211012201 - 2⁷ = 21011211012073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21011211011201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 912686071 + ... + 912709091.

It is an arithmetic number, because the mean of its divisors is an integer number (471267707040).

Almost surely, 2^{21011211012201} is an apocalyptic number.

It is an amenable number.

21011211012201 is a deficient number, since it is larger than the sum of its proper divisors (9149922238359).

21011211012201 is a wasteful number, since it uses less digits than its factorization.

21011211012201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24226.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21011211012201 its reverse (10221011211012), we get a palindrome (31232222223213).

The spelling of 21011211012201 in words is "twenty-one trillion, eleven billion, two hundred eleven million, twelve thousand, two hundred one".