211001221005 has 16 divisors (see below), whose sum is σ = 342226639680. Its totient is φ = 110992422528.

The previous prime is 211001221003. The next prime is 211001221019. The reversal of 211001221005 is 500122100112.

It is not a de Polignac number, because 211001221005 - 2¹ = 211001221003 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211001221003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96346495 + ... + 96348684.

It is an arithmetic number, because the mean of its divisors is an integer number (21389164980).

Almost surely, 2^211001221005 is an apocalyptic number.

It is an amenable number.

211001221005 is a deficient number, since it is larger than the sum of its proper divisors (131225418675).

211001221005 is a wasteful number, since it uses less digits than its factorization.

211001221005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192695260.

The product of its (nonzero) digits is 40, while the sum is 15.

Adding to 211001221005 its reverse (500122100112), we get a palindrome (711123321117).

The spelling of 211001221005 in words is "two hundred eleven billion, one million, two hundred twenty-one thousand, five".