21011101204 has 6 divisors (see below), whose sum is σ = 36769427114. Its totient is φ = 10505550600.

The previous prime is 21011101187. The next prime is 21011101207. The reversal of 21011101204 is 40210111012.

It can be written as a sum of positive squares in only one way, i.e., 20866380304 + 144720900 = 144452^2 + 12030^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011101207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2626387647 + ... + 2626387654.

Almost surely, 2^21011101204 is an apocalyptic number.

It is an amenable number.

21011101204 is a deficient number, since it is larger than the sum of its proper divisors (15758325910).

21011101204 is a wasteful number, since it uses less digits than its factorization.

21011101204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5252775305 (or 5252775303 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21011101204 its reverse (40210111012), we get a palindrome (61221212216).

The spelling of 21011101204 in words is "twenty-one billion, eleven million, one hundred one thousand, two hundred four".