21002001211211 has 8 divisors (see below), whose sum is σ = 21256115475600. Its totient is φ = 20748289985280.

The previous prime is 21002001211207. The next prime is 21002001211229. The reversal of 21002001211211 is 11211210020012.

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 21002001211211 - 2² = 21002001211207 is a prime.

It is a super-2 number, since 2×21002001211211² (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 (21002001216211) 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, 100654766 + ... + 100863203.

It is an arithmetic number, because the mean of its divisors is an integer number (2657014434450).

Almost surely, 2^{21002001211211} is an apocalyptic number.

21002001211211 is a deficient number, since it is larger than the sum of its proper divisors (254114264389).

21002001211211 is a wasteful number, since it uses less digits than its factorization.

21002001211211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201519229.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21002001211211 its reverse (11211210020012), we get a palindrome (32213211231223).

It can be divided in two parts, 210020012 and 11211, that multiplied together give a palindrome (2354534354532).

The spelling of 21002001211211 in words is "twenty-one trillion, two billion, one million, two hundred eleven thousand, two hundred eleven".