23242120315521 has 16 divisors (see below), whose sum is σ = 31963644445824. Its totient is φ = 15011266184064.

The previous prime is 23242120315511. The next prime is 23242120315553. The reversal of 23242120315521 is 12551302124232.

It is not a de Polignac number, because 23242120315521 - 2¹⁷ = 23242120184449 is a prime.

It is a super-2 number, since 2×23242120315521² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (23242120315511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 449305621 + ... + 449357346.

It is an arithmetic number, because the mean of its divisors is an integer number (1997727777864).

Almost surely, 2^{23242120315521} is an apocalyptic number.

It is an amenable number.

23242120315521 is a deficient number, since it is larger than the sum of its proper divisors (8721524130303).

23242120315521 is a wasteful number, since it uses less digits than its factorization.

23242120315521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 898663240.

The product of its (nonzero) digits is 28800, while the sum is 33.

Adding to 23242120315521 its reverse (12551302124232), we get a palindrome (35793422439753).

The spelling of 23242120315521 in words is "twenty-three trillion, two hundred forty-two billion, one hundred twenty million, three hundred fifteen thousand, five hundred twenty-one".