21111221100234 has 32 divisors (see below), whose sum is σ = 43205442508800. Its totient is φ = 6873248520432.

The previous prime is 21111221100169. The next prime is 21111221100239. The reversal of 21111221100234 is 43200112211112.

It is a super-2 number, since 2×21111221100234² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21111221100234.

It is not an unprimeable number, because it can be changed into a prime (21111221100239) 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, 9495079 + ... + 11505605.

It is an arithmetic number, because the mean of its divisors is an integer number (1350170078400).

Almost surely, 2^{21111221100234} is an apocalyptic number.

21111221100234 is an abundant number, since it is smaller than the sum of its proper divisors (22094221408566).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21111221100234 is a wasteful number, since it uses less digits than its factorization.

21111221100234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2051274.

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 21111221100234 its reverse (43200112211112), we get a palindrome (64311333311346).

The spelling of 21111221100234 in words is "twenty-one trillion, one hundred eleven billion, two hundred twenty-one million, one hundred thousand, two hundred thirty-four".