20100221023 has 4 divisors (see below), whose sum is σ = 20158147080. Its totient is φ = 20042294968.

The previous prime is 20100221003. The next prime is 20100221027. The reversal of 20100221023 is 32012200102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32012200102 = 2 ⋅16006100051.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20100221023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20100220994 and 20100221012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100221027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28962508 + ... + 28963201.

It is an arithmetic number, because the mean of its divisors is an integer number (5039536770).

Almost surely, 2^20100221023 is an apocalyptic number.

20100221023 is a deficient number, since it is larger than the sum of its proper divisors (57926057).

20100221023 is an equidigital number, since it uses as much as digits as its factorization.

20100221023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57926056.

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 20100221023 its reverse (32012200102), we get a palindrome (52112421125).

The spelling of 20100221023 in words is "twenty billion, one hundred million, two hundred twenty-one thousand, twenty-three".