20212123103 has 4 divisors (see below), whose sum is σ = 21090911088. Its totient is φ = 19333335120.

The previous prime is 20212123081. The next prime is 20212123109. The reversal of 20212123103 is 30132121202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20212123103 - 2¹² = 20212119007 is a prime.

It is a super-3 number, since 3×20212123103³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212123109) 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, 439393958 + ... + 439394003.

It is an arithmetic number, because the mean of its divisors is an integer number (5272727772).

Almost surely, 2^20212123103 is an apocalyptic number.

20212123103 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20212123103 is a deficient number, since it is larger than the sum of its proper divisors (878787985).

20212123103 is an equidigital number, since it uses as much as digits as its factorization.

20212123103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878787984.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 20212123103 its reverse (30132121202), we get a palindrome (50344244305).

The spelling of 20212123103 in words is "twenty billion, two hundred twelve million, one hundred twenty-three thousand, one hundred three".