21211220022001 has 8 divisors (see below), whose sum is σ = 21943029888000. Its totient is φ = 20479436055120.

The previous prime is 21211220021989. The next prime is 21211220022011. The reversal of 21211220022001 is 10022002211212.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21211220022001 - 2¹⁷ = 21211219890929 is a prime.

It is a super-2 number, since 2×21211220022001² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21211220022011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4801201 + ... + 8091598.

It is an arithmetic number, because the mean of its divisors is an integer number (2742878736000).

Almost surely, 2^{21211220022001} is an apocalyptic number.

It is an amenable number.

21211220022001 is a deficient number, since it is larger than the sum of its proper divisors (731809865999).

21211220022001 is a wasteful number, since it uses less digits than its factorization.

21211220022001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12949559.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21211220022001 its reverse (10022002211212), we get a palindrome (31233222233213).

The spelling of 21211220022001 in words is "twenty-one trillion, two hundred eleven billion, two hundred twenty million, twenty-two thousand, one".