23235220021 has 6 divisors (see below), whose sum is σ = 25160031330. Its totient is φ = 21447895248.

The previous prime is 23235219977. The next prime is 23235220027. The reversal of 23235220021 is 12002253232.

It can be written as a sum of positive squares in 3 ways, for example, as 3045936100 + 20189283921 = 55190^2 + 142089^2 .

It is not a de Polignac number, because 23235220021 - 2¹⁵ = 23235187253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23235219974 and 23235220001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23235220027) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 68743086 + ... + 68743423.

It is an arithmetic number, because the mean of its divisors is an integer number (4193338555).

Almost surely, 2^23235220021 is an apocalyptic number.

It is an amenable number.

23235220021 is a deficient number, since it is larger than the sum of its proper divisors (1924811309).

23235220021 is a wasteful number, since it uses less digits than its factorization.

23235220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137486535 (or 137486522 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

Adding to 23235220021 its reverse (12002253232), we get a palindrome (35237473253).

The spelling of 23235220021 in words is "twenty-three billion, two hundred thirty-five million, two hundred twenty thousand, twenty-one".