21100121023 has 8 divisors (see below), whose sum is σ = 21547231200. Its totient is φ = 20654825568.

The previous prime is 21100120973. The next prime is 21100121033. The reversal of 21100121023 is 32012100112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21100121023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21100120994 and 21100121012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100121033) 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, 430168 + ... + 476701.

It is an arithmetic number, because the mean of its divisors is an integer number (2693403900).

Almost surely, 2^21100121023 is an apocalyptic number.

21100121023 is a deficient number, since it is larger than the sum of its proper divisors (447110177).

21100121023 is an equidigital number, since it uses as much as digits as its factorization.

21100121023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 907361.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21100121023 its reverse (32012100112), we get a palindrome (53112221135).

The spelling of 21100121023 in words is "twenty-one billion, one hundred million, one hundred twenty-one thousand, twenty-three".