211221210001005 has 32 divisors (see below), whose sum is σ = 376225111221120. Its totient is φ = 112435090634880.

The previous prime is 211221210001003. The next prime is 211221210001033. The reversal of 211221210001005 is 500100012122112.

It is not a de Polignac number, because 211221210001005 - 2¹ = 211221210001003 is a prime.

It is a super-2 number, since 2×211221210001005² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211221210001003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1501466667 + ... + 1501607336.

It is an arithmetic number, because the mean of its divisors is an integer number (11757034725660).

Almost surely, 2^{211221210001005} is an apocalyptic number.

It is an amenable number.

211221210001005 is a deficient number, since it is larger than the sum of its proper divisors (165003901220115).

211221210001005 is a wasteful number, since it uses less digits than its factorization.

211221210001005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3003074538 (or 3003074532 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

Adding to 211221210001005 its reverse (500100012122112), we get a palindrome (711321222123117).

The spelling of 211221210001005 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred ten million, one thousand, five".