211221222221001 has 4 divisors (see below), whose sum is σ = 281628296294672. Its totient is φ = 140814148147332.

The previous prime is 211221222220963. The next prime is 211221222221071. The reversal of 211221222221001 is 100122222122112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 211221222221001 - 2¹¹ = 211221222218953 is a prime.

It is a super-4 number, since 4×211221222221001⁴ (a number of 58 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211221222221071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35203537036831 + ... + 35203537036836.

It is an arithmetic number, because the mean of its divisors is an integer number (70407074073668).

Almost surely, 2^{211221222221001} is an apocalyptic number.

It is an amenable number.

211221222221001 is a deficient number, since it is larger than the sum of its proper divisors (70407074073671).

211221222221001 is an equidigital number, since it uses as much as digits as its factorization.

211221222221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70407074073670.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 211221222221001 its reverse (100122222122112), we get a palindrome (311343444343113).

The spelling of 211221222221001 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred twenty-two million, two hundred twenty-one thousand, one".