21111302423 has 8 divisors (see below), whose sum is σ = 22478024880. Its totient is φ = 19758455680.

The previous prime is 21111302419. The next prime is 21111302441. The reversal of 21111302423 is 32420311112.

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 21111302423 - 2² = 21111302419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21111302395 and 21111302404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111302413) 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, 3465788 + ... + 3471873.

It is an arithmetic number, because the mean of its divisors is an integer number (2809753110).

Almost surely, 2^21111302423 is an apocalyptic number.

21111302423 is a deficient number, since it is larger than the sum of its proper divisors (1366722457).

21111302423 is a wasteful number, since it uses less digits than its factorization.

21111302423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6937857.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21111302423 its reverse (32420311112), we get a palindrome (53531613535).

The spelling of 21111302423 in words is "twenty-one billion, one hundred eleven million, three hundred two thousand, four hundred twenty-three".