2101020123 has 32 divisors (see below), whose sum is σ = 3101193216. Its totient is φ = 1258492928.

The previous prime is 2101020049. The next prime is 2101020137. The reversal of 2101020123 is 3210201012.

It is a cyclic number.

It is not a de Polignac number, because 2101020123 - 2¹⁴ = 2101003739 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2101020099 and 2101020108.

It is not an unprimeable number, because it can be changed into a prime (2101020023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 722290 + ... + 725192.

It is an arithmetic number, because the mean of its divisors is an integer number (96912288).

Almost surely, 2^2101020123 is an apocalyptic number.

2101020123 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2101020123 is a deficient number, since it is larger than the sum of its proper divisors (1000173093).

2101020123 is a wasteful number, since it uses less digits than its factorization.

2101020123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3563.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 2101020123 is about 45836.8860526105. The cubic root of 2101020123 is about 1280.7864882870.

Adding to 2101020123 its reverse (3210201012), we get a palindrome (5311221135).

The spelling of 2101020123 in words is "two billion, one hundred one million, twenty thousand, one hundred twenty-three".