21123302104 has 8 divisors (see below), whose sum is σ = 39606191460. Its totient is φ = 10561651048.

The previous prime is 21123302059. The next prime is 21123302107. The reversal of 21123302104 is 40120332112.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123302107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1320206374 + ... + 1320206389.

Almost surely, 2^21123302104 is an apocalyptic number.

It is an amenable number.

21123302104 is a deficient number, since it is larger than the sum of its proper divisors (18482889356).

21123302104 is a wasteful number, since it uses less digits than its factorization.

21123302104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2640412769 (or 2640412765 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21123302104 its reverse (40120332112), we get a palindrome (61243634216).

The spelling of 21123302104 in words is "twenty-one billion, one hundred twenty-three million, three hundred two thousand, one hundred four".