21123023102 has 16 divisors (see below), whose sum is σ = 34428019200. Its totient is φ = 9682879320.

The previous prime is 21123023101. The next prime is 21123023111. The reversal of 21123023102 is 20132032112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123023101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8964452 + ... + 8966807.

It is an arithmetic number, because the mean of its divisors is an integer number (2151751200).

Almost surely, 2^21123023102 is an apocalyptic number.

21123023102 is a deficient number, since it is larger than the sum of its proper divisors (13304996098).

21123023102 is a wasteful number, since it uses less digits than its factorization.

21123023102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17931311.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21123023102 its reverse (20132032112), we get a palindrome (41255055214).

The spelling of 21123023102 in words is "twenty-one billion, one hundred twenty-three million, twenty-three thousand, one hundred two".