7542411021 has 12 divisors (see below), whose sum is σ = 10895513148. Its totient is φ = 5027849664.

The previous prime is 7542411013. The next prime is 7542411043. The reversal of 7542411021 is 1201142457.

7542411021 is a `hidden beast` number, since 7 + 542 + 4 + 110 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6928065225 + 614345796 = 83235^2 + 24786^2 .

It is not a de Polignac number, because 7542411021 - 2³ = 7542411013 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7542411421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 107641 + ... + 163313.

It is an arithmetic number, because the mean of its divisors is an integer number (907959429).

Almost surely, 2^7542411021 is an apocalyptic number.

It is an amenable number.

7542411021 is a deficient number, since it is larger than the sum of its proper divisors (3353102127).

7542411021 is a wasteful number, since it uses less digits than its factorization.

7542411021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70732 (or 70729 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 7542411021 is about 86847.0553386815. The cubic root of 7542411021 is about 1961.1165217165.

Adding to 7542411021 its reverse (1201142457), we get a palindrome (8743553478).

The spelling of 7542411021 in words is "seven billion, five hundred forty-two million, four hundred eleven thousand, twenty-one".