211221100031001 has 8 divisors (see below), whose sum is σ = 285193046455680. Its totient is φ = 139031610146832.

The previous prime is 211221100030999. The next prime is 211221100031083. The reversal of 211221100031001 is 100130001122112.

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

It is not a de Polignac number, because 211221100031001 - 2¹ = 211221100030999 is a prime.

It is a super-2 number, since 2×211221100031001² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211221100031701) 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, 445614134850 + ... + 445614135323.

It is an arithmetic number, because the mean of its divisors is an integer number (35649130806960).

Almost surely, 2^{211221100031001} is an apocalyptic number.

It is an amenable number.

211221100031001 is a deficient number, since it is larger than the sum of its proper divisors (73971946424679).

211221100031001 is an equidigital number, since it uses as much as digits as its factorization.

211221100031001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 891228270255.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 211221100031001 its reverse (100130001122112), we get a palindrome (311351101153113).

The spelling of 211221100031001 in words is "two hundred eleven trillion, two hundred twenty-one billion, one hundred million, thirty-one thousand, one".