21100211121201 has 8 divisors (see below), whose sum is σ = 28136237074080. Its totient is φ = 14065496291232.

The previous prime is 21100211121179. The next prime is 21100211121257. The reversal of 21100211121201 is 10212111200112.

It is a happy number.

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

It is not a de Polignac number, because 21100211121201 - 2⁵ = 21100211121169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21100211121401) 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, 327743175 + ... + 327807548.

It is an arithmetic number, because the mean of its divisors is an integer number (3517029634260).

Almost surely, 2^{21100211121201} is an apocalyptic number.

It is an amenable number.

21100211121201 is a deficient number, since it is larger than the sum of its proper divisors (7036025952879).

21100211121201 is a wasteful number, since it uses less digits than its factorization.

21100211121201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655561455.

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

Adding to 21100211121201 its reverse (10212111200112), we get a palindrome (31312322321313).

The spelling of 21100211121201 in words is "twenty-one trillion, one hundred billion, two hundred eleven million, one hundred twenty-one thousand, two hundred one".