21212220011001 has 8 divisors (see below), whose sum is σ = 28452319057344. Its totient is φ = 14056800486000.

The previous prime is 21212220010997. The next prime is 21212220011083. The reversal of 21212220011001 is 10011002221212.

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

It is not a de Polignac number, because 21212220011001 - 2² = 21212220010997 is a prime.

It is a super-2 number, since 2×21212220011001² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21212220011201) 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, 21169879750 + ... + 21169880751.

It is an arithmetic number, because the mean of its divisors is an integer number (3556539882168).

Almost surely, 2^{21212220011001} is an apocalyptic number.

It is an amenable number.

21212220011001 is a deficient number, since it is larger than the sum of its proper divisors (7240099046343).

21212220011001 is a wasteful number, since it uses less digits than its factorization.

21212220011001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42339760671.

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

Adding to 21212220011001 its reverse (10011002221212), we get a palindrome (31223222232213).

The spelling of 21212220011001 in words is "twenty-one trillion, two hundred twelve billion, two hundred twenty million, eleven thousand, one".