21144032123 has 8 divisors (see below), whose sum is σ = 21462215760. Its totient is φ = 20825925120.

The previous prime is 21144032101. The next prime is 21144032209. The reversal of 21144032123 is 32123044112.

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 21144032123 - 2¹⁸ = 21143769979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21144032023) 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, 793643 + ... + 819851.

It is an arithmetic number, because the mean of its divisors is an integer number (2682776970).

Almost surely, 2^21144032123 is an apocalyptic number.

21144032123 is a deficient number, since it is larger than the sum of its proper divisors (318183637).

21144032123 is a wasteful number, since it uses less digits than its factorization.

21144032123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38317.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21144032123 its reverse (32123044112), we get a palindrome (53267076235).

The spelling of 21144032123 in words is "twenty-one billion, one hundred forty-four million, thirty-two thousand, one hundred twenty-three".