21201011001111 has 64 divisors (see below), whose sum is σ = 32844483072000. Its totient is φ = 12075174144000.

The previous prime is 21201011001109. The next prime is 21201011001127. The reversal of 21201011001111 is 11110011010212.

It is not a de Polignac number, because 21201011001111 - 2¹ = 21201011001109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201011001151) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 460036 + ... + 6527913.

It is an arithmetic number, because the mean of its divisors is an integer number (513195048000).

Almost surely, 2^{21201011001111} is an apocalyptic number.

21201011001111 is a deficient number, since it is larger than the sum of its proper divisors (11643472070889).

21201011001111 is a wasteful number, since it uses less digits than its factorization.

21201011001111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6988120.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 21201011001111 its reverse (11110011010212), we get a palindrome (32311022011323).

The spelling of 21201011001111 in words is "twenty-one trillion, two hundred one billion, eleven million, one thousand, one hundred eleven".