21123323102 has 16 divisors (see below), whose sum is σ = 36218161152. Its totient is φ = 9051165240.

The previous prime is 21123323077. The next prime is 21123323153. The reversal of 21123323102 is 20132332112.

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, 61298 + ... + 214485.

It is an arithmetic number, because the mean of its divisors is an integer number (2263635072).

Almost surely, 2^21123323102 is an apocalyptic number.

21123323102 is a deficient number, since it is larger than the sum of its proper divisors (15094838050).

21123323102 is a wasteful number, since it uses less digits than its factorization.

21123323102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281263.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21123323102 its reverse (20132332112), we get a palindrome (41255655214).

The spelling of 21123323102 in words is "twenty-one billion, one hundred twenty-three million, three hundred twenty-three thousand, one hundred two".