21101103110123 has 16 divisors (see below), whose sum is σ = 23520541497120. Its totient is φ = 18812778541056.

The previous prime is 21101103110119. The next prime is 21101103110201. The reversal of 21101103110123 is 32101130110112.

It is a cyclic number.

It is not a de Polignac number, because 21101103110123 - 2² = 21101103110119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21101103110023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 163811 + ... + 6498387.

It is an arithmetic number, because the mean of its divisors is an integer number (1470033843570).

Almost surely, 2^{21101103110123} is an apocalyptic number.

21101103110123 is a deficient number, since it is larger than the sum of its proper divisors (2419438386997).

21101103110123 is a wasteful number, since it uses less digits than its factorization.

21101103110123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6344926.

The product of its (nonzero) digits is 36, while the sum is 17.

Adding to 21101103110123 its reverse (32101130110112), we get a palindrome (53202233220235).

The spelling of 21101103110123 in words is "twenty-one trillion, one hundred one billion, one hundred three million, one hundred ten thousand, one hundred twenty-three".