20242555521 has 12 divisors (see below), whose sum is σ = 28485370512. Its totient is φ = 12784771224.

The previous prime is 20242555493. The next prime is 20242555549. The reversal of 20242555521 is 12555524202.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20242555493) and next prime (20242555549).

It is not a de Polignac number, because 20242555521 - 2¹³ = 20242547329 is a prime.

It is a super-2 number, since 2×20242555521² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20242555591) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9344511 + ... + 9346676.

It is an arithmetic number, because the mean of its divisors is an integer number (2373780876).

Almost surely, 2^20242555521 is an apocalyptic number.

It is an amenable number.

20242555521 is a deficient number, since it is larger than the sum of its proper divisors (8242814991).

20242555521 is a wasteful number, since it uses less digits than its factorization.

20242555521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18691228 (or 18691209 counting only the distinct ones).

The product of its (nonzero) digits is 40000, while the sum is 33.

The spelling of 20242555521 in words is "twenty billion, two hundred forty-two million, five hundred fifty-five thousand, five hundred twenty-one".