5215211521 has 16 divisors (see below), whose sum is σ = 6003527040. Its totient is φ = 4492414080.

The previous prime is 5215211513. The next prime is 5215211537. The reversal of 5215211521 is 1251125125.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 5215211521 - 2³ = 5215211513 is a prime.

It is a super-2 number, since 2×5215211521² = 54396862417542266882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5215211581) 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, 200451 + ... + 224968.

It is an arithmetic number, because the mean of its divisors is an integer number (375220440).

Almost surely, 2^5215211521 is an apocalyptic number.

It is an amenable number.

5215211521 is a deficient number, since it is larger than the sum of its proper divisors (788315519).

5215211521 is a wasteful number, since it uses less digits than its factorization.

5215211521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425496.

The product of its digits is 1000, while the sum is 25.

The square root of 5215211521 is about 72216.4214081534. The cubic root of 5215211521 is about 1734.1659012592.

Adding to 5215211521 its reverse (1251125125), we get a palindrome (6466336646).

The spelling of 5215211521 in words is "five billion, two hundred fifteen million, two hundred eleven thousand, five hundred twenty-one".