21201402111 has 16 divisors (see below), whose sum is σ = 29763123840. Its totient is φ = 13387312800.

The previous prime is 21201402059. The next prime is 21201402113. The reversal of 21201402111 is 11120410212.

It is not a de Polignac number, because 21201402111 - 2¹⁰ = 21201401087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201402113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 225121 + ... + 305093.

It is an arithmetic number, because the mean of its divisors is an integer number (1860195240).

Almost surely, 2^21201402111 is an apocalyptic number.

21201402111 is a deficient number, since it is larger than the sum of its proper divisors (8561721729).

21201402111 is a wasteful number, since it uses less digits than its factorization.

21201402111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84646.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21201402111 its reverse (11120410212), we get a palindrome (32321812323).

The spelling of 21201402111 in words is "twenty-one billion, two hundred one million, four hundred two thousand, one hundred eleven".