21100123451101 has 4 divisors (see below), whose sum is σ = 22017520122912. Its totient is φ = 20182726779292.

The previous prime is 21100123451087. The next prime is 21100123451131. The reversal of 21100123451101 is 10115432100112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21100123451101 - 2²³ = 21100115062493 is a prime.

It is a super-2 number, since 2×21100123451101² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100123451131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 458698335871 + ... + 458698335916.

It is an arithmetic number, because the mean of its divisors is an integer number (5504380030728).

Almost surely, 2^{21100123451101} is an apocalyptic number.

It is an amenable number.

21100123451101 is a deficient number, since it is larger than the sum of its proper divisors (917396671811).

21100123451101 is an equidigital number, since it uses as much as digits as its factorization.

21100123451101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 917396671810.

The product of its (nonzero) digits is 240, while the sum is 22.

Adding to 21100123451101 its reverse (10115432100112), we get a palindrome (31215555551213).

The spelling of 21100123451101 in words is "twenty-one trillion, one hundred billion, one hundred twenty-three million, four hundred fifty-one thousand, one hundred one".