21012220211001 has 4 divisors (see below), whose sum is σ = 28016293614672. Its totient is φ = 14008146807332.

The previous prime is 21012220210897. The next prime is 21012220211027. The reversal of 21012220211001 is 10011202221012.

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 a cyclic number.

It is not a de Polignac number, because 21012220211001 - 2⁷ = 21012220210873 is a prime.

It is a super-2 number, since 2×21012220211001² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21012220211401) 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, 3502036701831 + ... + 3502036701836.

It is an arithmetic number, because the mean of its divisors is an integer number (7004073403668).

Almost surely, 2^{21012220211001} is an apocalyptic number.

It is an amenable number.

21012220211001 is a deficient number, since it is larger than the sum of its proper divisors (7004073403671).

21012220211001 is an equidigital number, since it uses as much as digits as its factorization.

21012220211001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7004073403670.

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

Adding to 21012220211001 its reverse (10011202221012), we get a palindrome (31023422432013).

The spelling of 21012220211001 in words is "twenty-one trillion, twelve billion, two hundred twenty million, two hundred eleven thousand, one".