21002001211 has 8 divisors (see below), whose sum is σ = 21057419600. Its totient is φ = 20946615552.

The previous prime is 21002001203. The next prime is 21002001217. The reversal of 21002001211 is 11210020012.

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 21002001211 - 2³ = 21002001203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002001217) 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 7 ways as a sum of consecutive naturals, for example, 1768951 + ... + 1780783.

It is an arithmetic number, because the mean of its divisors is an integer number (2632177450).

Almost surely, 2^21002001211 is an apocalyptic number.

21002001211 is a deficient number, since it is larger than the sum of its proper divisors (55418389).

21002001211 is a wasteful number, since it uses less digits than its factorization.

21002001211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16365.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21002001211 its reverse (11210020012), we get a palindrome (32212021223).

It can be divided in two parts, 210020012 and 11, that multiplied together give a palindrome (2310220132).

The spelling of 21002001211 in words is "twenty-one billion, two million, one thousand, two hundred eleven".