21113020123 has 8 divisors (see below), whose sum is σ = 22793805216. Its totient is φ = 19440336000.

The previous prime is 21113020099. The next prime is 21113020129. The reversal of 21113020123 is 32102031112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21113020123 - 2⁵ = 21113020091 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21113020097 and 21113020106.

It is not an unprimeable number, because it can be changed into a prime (21113020129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2019823 + ... + 2030248.

It is an arithmetic number, because the mean of its divisors is an integer number (2849225652).

Almost surely, 2^21113020123 is an apocalyptic number.

21113020123 is a deficient number, since it is larger than the sum of its proper divisors (1680785093).

21113020123 is a wasteful number, since it uses less digits than its factorization.

21113020123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4050485.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21113020123 its reverse (32102031112), we get a palindrome (53215051235).

The spelling of 21113020123 in words is "twenty-one billion, one hundred thirteen million, twenty thousand, one hundred twenty-three".