21211210001111 has 32 divisors (see below), whose sum is σ = 23713101834240. Its totient is φ = 18840814876800.

The previous prime is 21211210001077. The next prime is 21211210001161. The reversal of 21211210001111 is 11110001211212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21211210001111 is a prime.

It is a super-2 number, since 2×21211210001111² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211210001161) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 762896936 + ... + 762924738.

It is an arithmetic number, because the mean of its divisors is an integer number (741034432320).

Almost surely, 2^{21211210001111} is an apocalyptic number.

21211210001111 is a deficient number, since it is larger than the sum of its proper divisors (2501891833129).

21211210001111 is a wasteful number, since it uses less digits than its factorization.

21211210001111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38487.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 21211210001111 its reverse (11110001211212), we get a palindrome (32321211212323).

The spelling of 21211210001111 in words is "twenty-one trillion, two hundred eleven billion, two hundred ten million, one thousand, one hundred eleven".