21211001021001 has 16 divisors (see below), whose sum is σ = 30853950747840. Its totient is φ = 12854491456320.

The previous prime is 21211001020921. The next prime is 21211001021009. The reversal of 21211001021001 is 10012010011212.

It is not a de Polignac number, because 21211001021001 - 2¹³ = 21211001012809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21211001021009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15864730 + ... + 17149683.

It is an arithmetic number, because the mean of its divisors is an integer number (1928371921740).

Almost surely, 2^{21211001021001} is an apocalyptic number.

It is an amenable number.

21211001021001 is a deficient number, since it is larger than the sum of its proper divisors (9642949726839).

21211001021001 is a wasteful number, since it uses less digits than its factorization.

21211001021001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33033896.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21211001021001 its reverse (10012010011212), we get a palindrome (31223011032213).

The spelling of 21211001021001 in words is "twenty-one trillion, two hundred eleven billion, one million, twenty-one thousand, one".