23103213221521 has 4 divisors (see below), whose sum is σ = 23103304414132. Its totient is φ = 23103122028912.

The previous prime is 23103213221503. The next prime is 23103213221563. The reversal of 23103213221521 is 12512231230132.

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 16369395819921 + 6733817401600 = 4045911^2 + 2594960^2 .

It is a cyclic number.

It is not a de Polignac number, because 23103213221521 - 2¹⁷ = 23103213090449 is a prime.

It is a super-2 number, since 2×23103213221521² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23103213221521.

It is not an unprimeable number, because it can be changed into a prime (23103213921521) 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, 45215226 + ... + 45723331.

It is an arithmetic number, because the mean of its divisors is an integer number (5775826103533).

Almost surely, 2^{23103213221521} is an apocalyptic number.

It is an amenable number.

23103213221521 is a deficient number, since it is larger than the sum of its proper divisors (91192611).

23103213221521 is an equidigital number, since it uses as much as digits as its factorization.

23103213221521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91192610.

The product of its (nonzero) digits is 4320, while the sum is 28.

Adding to 23103213221521 its reverse (12512231230132), we get a palindrome (35615444451653).

The spelling of 23103213221521 in words is "twenty-three trillion, one hundred three billion, two hundred thirteen million, two hundred twenty-one thousand, five hundred twenty-one".