21102001211 has 8 divisors (see below), whose sum is σ = 21203120400. Its totient is φ = 21000994560.

The previous prime is 21102001187. The next prime is 21102001229. The reversal of 21102001211 is 11210020112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21102001211 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21102001192 and 21102001201.

It is not an unprimeable number, because it can be changed into a prime (21102001231) 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, 360560 + ... + 414978.

It is an arithmetic number, because the mean of its divisors is an integer number (2650390050).

Almost surely, 2^21102001211 is an apocalyptic number.

21102001211 is a deficient number, since it is larger than the sum of its proper divisors (101119189).

21102001211 is a wasteful number, since it uses less digits than its factorization.

21102001211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56269.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21102001211 its reverse (11210020112), we get a palindrome (32312021323).

The spelling of 21102001211 in words is "twenty-one billion, one hundred two million, one thousand, two hundred eleven".