21256214103123 has 8 divisors (see below), whose sum is σ = 28353766957008. Its totient is φ = 14164735325664.

The previous prime is 21256214103121. The next prime is 21256214103151. The reversal of 21256214103123 is 32130141265212.

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

It is not a de Polignac number, because 21256214103123 - 2¹ = 21256214103121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21256214103121) 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, 1518510940 + ... + 1518524937.

It is an arithmetic number, because the mean of its divisors is an integer number (3544220869626).

Almost surely, 2^{21256214103123} is an apocalyptic number.

21256214103123 is a deficient number, since it is larger than the sum of its proper divisors (7097552853885).

21256214103123 is a wasteful number, since it uses less digits than its factorization.

21256214103123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3037038213.

The product of its (nonzero) digits is 17280, while the sum is 33.

Adding to 21256214103123 its reverse (32130141265212), we get a palindrome (53386355368335).

The spelling of 21256214103123 in words is "twenty-one trillion, two hundred fifty-six billion, two hundred fourteen million, one hundred three thousand, one hundred twenty-three".