211221201005 has 16 divisors (see below), whose sum is σ = 253747154304. Its totient is φ = 168789257280.

The previous prime is 211221200977. The next prime is 211221201041. The reversal of 211221201005 is 500102122112.

It is not a de Polignac number, because 211221201005 - 2²⁴ = 211204423789 is a prime.

It is a super-2 number, since 2×211221201005² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26845082 + ... + 26852948.

It is an arithmetic number, because the mean of its divisors is an integer number (15859197144).

Almost surely, 2^211221201005 is an apocalyptic number.

It is an amenable number.

211221201005 is a deficient number, since it is larger than the sum of its proper divisors (42525953299).

211221201005 is a wasteful number, since it uses less digits than its factorization.

211221201005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13156.

The product of its (nonzero) digits is 80, while the sum is 17.

Adding to 211221201005 its reverse (500102122112), we get a palindrome (711323323117).

The spelling of 211221201005 in words is "two hundred eleven billion, two hundred twenty-one million, two hundred one thousand, five".