211221221001 has 8 divisors (see below), whose sum is σ = 321860908224. Its totient is φ = 120697840560.

The previous prime is 211221220913. The next prime is 211221221009. The reversal of 211221221001 is 100122122112.

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

It is not a de Polignac number, because 211221221001 - 2¹⁴ = 211221204617 is a prime.

It is a super-2 number, since 2×211221221001² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211221221009) 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, 5029076670 + ... + 5029076711.

It is an arithmetic number, because the mean of its divisors is an integer number (40232613528).

Almost surely, 2^211221221001 is an apocalyptic number.

211221221001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

211221221001 is a deficient number, since it is larger than the sum of its proper divisors (110639687223).

211221221001 is a wasteful number, since it uses less digits than its factorization.

211221221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10058153391.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 211221221001 its reverse (100122122112), we get a palindrome (311343343113).

The spelling of 211221221001 in words is "two hundred eleven billion, two hundred twenty-one million, two hundred twenty-one thousand, one".