21211011001001 has 8 divisors (see below), whose sum is σ = 21225709683360. Its totient is φ = 21196313660992.

The previous prime is 21211011000997. The next prime is 21211011001027. The reversal of 21211011001001 is 10010011011212.

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 21211011001001 - 2² = 21211011000997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21211011061001) 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, 32380346 + ... + 33028908.

It is an arithmetic number, because the mean of its divisors is an integer number (2653213710420).

Almost surely, 2^{21211011001001} is an apocalyptic number.

It is an amenable number.

21211011001001 is a deficient number, since it is larger than the sum of its proper divisors (14698682359).

21211011001001 is a wasteful number, since it uses less digits than its factorization.

21211011001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 671175.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21211011001001 its reverse (10010011011212), we get a palindrome (31221022012213).

The spelling of 21211011001001 in words is "twenty-one trillion, two hundred eleven billion, eleven million, one thousand, one".