5217542421 has 16 divisors (see below), whose sum is σ = 8562121344. Its totient is φ = 2752110144.

The previous prime is 5217542417. The next prime is 5217542459. The reversal of 5217542421 is 1242457125.

It is not a de Polignac number, because 5217542421 - 2² = 5217542417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5217542401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9555666 + ... + 9556211.

It is an arithmetic number, because the mean of its divisors is an integer number (535132584).

Almost surely, 2^5217542421 is an apocalyptic number.

It is an amenable number.

5217542421 is a deficient number, since it is larger than the sum of its proper divisors (3344578923).

5217542421 is a wasteful number, since it uses less digits than its factorization.

5217542421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19111900.

The product of its digits is 22400, while the sum is 33.

The square root of 5217542421 is about 72232.5579015446. The cubic root of 5217542421 is about 1734.4242202955.

Adding to 5217542421 its reverse (1242457125), we get a palindrome (6459999546).

The spelling of 5217542421 in words is "five billion, two hundred seventeen million, five hundred forty-two thousand, four hundred twenty-one".