21100234004 has 24 divisors (see below), whose sum is σ = 38204679240. Its totient is φ = 10184725376.

The previous prime is 21100233991. The next prime is 21100234037. The reversal of 21100234004 is 40043200112.

It can be written as a sum of positive squares in 4 ways, for example, as 8299574404 + 12800659600 = 91102^2 + 113140^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1113134 + ... + 1131930.

It is an arithmetic number, because the mean of its divisors is an integer number (1591861635).

Almost surely, 2^21100234004 is an apocalyptic number.

It is an amenable number.

21100234004 is a deficient number, since it is larger than the sum of its proper divisors (17104445236).

21100234004 is a wasteful number, since it uses less digits than its factorization.

21100234004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28507 (or 28505 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21100234004 its reverse (40043200112), we get a palindrome (61143434116).

The spelling of 21100234004 in words is "twenty-one billion, one hundred million, two hundred thirty-four thousand, four".