23120221130021 has 4 divisors (see below), whose sum is σ = 23275390399500. Its totient is φ = 22965051860544.

The previous prime is 23120221129991. The next prime is 23120221130029. The reversal of 23120221130021 is 12003112202132.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1810558624900 + 21309662505121 = 1345570^2 + 4616239^2 .

It is a cyclic number.

It is not a de Polignac number, because 23120221130021 - 2³⁸ = 22845343223077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23120221129975 and 23120221130002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23120221130029) 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, 77584634516 + ... + 77584634813.

It is an arithmetic number, because the mean of its divisors is an integer number (5818847599875).

Almost surely, 2^{23120221130021} is an apocalyptic number.

It is an amenable number.

23120221130021 is a deficient number, since it is larger than the sum of its proper divisors (155169269479).

23120221130021 is a wasteful number, since it uses less digits than its factorization.

23120221130021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155169269478.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 23120221130021 its reverse (12003112202132), we get a palindrome (35123333332153).

The spelling of 23120221130021 in words is "twenty-three trillion, one hundred twenty billion, two hundred twenty-one million, one hundred thirty thousand, twenty-one".