21031003100123 has 8 divisors (see below), whose sum is σ = 22277512841040. Its totient is φ = 19785536904960.

The previous prime is 21031003100111. The next prime is 21031003100131. The reversal of 21031003100123 is 32100130013012.

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 21031003100123 - 2⁴² = 16632956589019 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 (21031003100143) 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, 260844938 + ... + 260925551.

It is an arithmetic number, because the mean of its divisors is an integer number (2784689105130).

Almost surely, 2^{21031003100123} is an apocalyptic number.

21031003100123 is a deficient number, since it is larger than the sum of its proper divisors (1246509740917).

21031003100123 is a wasteful number, since it uses less digits than its factorization.

21031003100123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521772877.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21031003100123 its reverse (32100130013012), we get a palindrome (53131133113135).

The spelling of 21031003100123 in words is "twenty-one trillion, thirty-one billion, three million, one hundred thousand, one hundred twenty-three".