211211101012001 has 4 divisors (see below), whose sum is σ = 211215887276100. Its totient is φ = 211206314747904.

The previous prime is 211211101011971. The next prime is 211211101012049. The reversal of 211211101012001 is 100210101112112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 99544539794401 + 111666561217600 = 9977201^2 + 10567240^2 .

It is a cyclic number.

It is not a de Polignac number, because 211211101012001 - 2²² = 211211096817697 is a prime.

It is a super-2 number, since 2×211211101012001² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211211101002001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2393065856 + ... + 2393154113.

It is an arithmetic number, because the mean of its divisors is an integer number (52803971819025).

Almost surely, 2^{211211101012001} is an apocalyptic number.

It is an amenable number.

211211101012001 is a deficient number, since it is larger than the sum of its proper divisors (4786264099).

211211101012001 is an equidigital number, since it uses as much as digits as its factorization.

211211101012001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4786264098.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 211211101012001 its reverse (100210101112112), we get a palindrome (311421202124113).

The spelling of 211211101012001 in words is "two hundred eleven trillion, two hundred eleven billion, one hundred one million, twelve thousand, one".