21020441123 has 4 divisors (see below), whose sum is σ = 22931390328. Its totient is φ = 19109491920.

The previous prime is 21020441119. The next prime is 21020441131. The reversal of 21020441123 is 32114402012.

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 21020441123 - 2² = 21020441119 is a prime.

It is a super-2 number, since 2×21020441123² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21020441095 and 21020441104.

It is not an unprimeable number, because it can be changed into a prime (21020441153) 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, 955474586 + ... + 955474607.

It is an arithmetic number, because the mean of its divisors is an integer number (5732847582).

Almost surely, 2^21020441123 is an apocalyptic number.

21020441123 is a deficient number, since it is larger than the sum of its proper divisors (1910949205).

21020441123 is a wasteful number, since it uses less digits than its factorization.

21020441123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1910949204.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21020441123 its reverse (32114402012), we get a palindrome (53134843135).

The spelling of 21020441123 in words is "twenty-one billion, twenty million, four hundred forty-one thousand, one hundred twenty-three".