20021012100123 has 16 divisors (see below), whose sum is σ = 27330572793216. Its totient is φ = 13029739208640.

The previous prime is 20021012100119. The next prime is 20021012100179. The reversal of 20021012100123 is 32100121012002.

It is not a de Polignac number, because 20021012100123 - 2² = 20021012100119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20021012102123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42616090 + ... + 43083327.

It is an arithmetic number, because the mean of its divisors is an integer number (1708160799576).

Almost surely, 2^{20021012100123} is an apocalyptic number.

20021012100123 is a deficient number, since it is larger than the sum of its proper divisors (7309560693093).

20021012100123 is a wasteful number, since it uses less digits than its factorization.

20021012100123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85701274.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 20021012100123 its reverse (32100121012002), we get a palindrome (52121133112125).

The spelling of 20021012100123 in words is "twenty trillion, twenty-one billion, twelve million, one hundred thousand, one hundred twenty-three".