21023312211111 has 64 divisors (see below), whose sum is σ = 35418666756096. Its totient is φ = 10807752806400.

The previous prime is 21023312211089. The next prime is 21023312211127. The reversal of 21023312211111 is 11111221332012.

It is not a de Polignac number, because 21023312211111 - 2⁶ = 21023312211047 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023312211131) 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, 11296081 + ... + 13024901.

It is an arithmetic number, because the mean of its divisors is an integer number (553416668064).

Almost surely, 2^{21023312211111} is an apocalyptic number.

21023312211111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21023312211111 is a deficient number, since it is larger than the sum of its proper divisors (14395354544985).

21023312211111 is a wasteful number, since it uses less digits than its factorization.

21023312211111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1730352.

The product of its (nonzero) digits is 144, while the sum is 21.

Adding to 21023312211111 its reverse (11111221332012), we get a palindrome (32134533543123).

The spelling of 21023312211111 in words is "twenty-one trillion, twenty-three billion, three hundred twelve million, two hundred eleven thousand, one hundred eleven".