2100021003123 has 8 divisors (see below), whose sum is σ = 2947397899200. Its totient is φ = 1326329054568.

The previous prime is 2100021003071. The next prime is 2100021003137. The reversal of 2100021003123 is 3213001200012.

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

It is not a de Polignac number, because 2100021003123 - 2¹³ = 2100020994931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2100021003173) 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, 18421236813 + ... + 18421236926.

It is an arithmetic number, because the mean of its divisors is an integer number (368424737400).

Almost surely, 2^{2100021003123} is an apocalyptic number.

2100021003123 is a deficient number, since it is larger than the sum of its proper divisors (847376896077).

2100021003123 is a wasteful number, since it uses less digits than its factorization.

2100021003123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36842473761.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 2100021003123 its reverse (3213001200012), we get a palindrome (5313022203135).

The spelling of 2100021003123 in words is "two trillion, one hundred billion, twenty-one million, three thousand, one hundred twenty-three".