5211206621 has 4 divisors (see below), whose sum is σ = 5252239872. Its totient is φ = 5170173372.

The previous prime is 5211206599. The next prime is 5211206647. The reversal of 5211206621 is 1266021125.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 5211206621 - 2⁶ = 5211206557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5211206681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20516435 + ... + 20516688.

It is an arithmetic number, because the mean of its divisors is an integer number (1313059968).

Almost surely, 2^5211206621 is an apocalyptic number.

It is an amenable number.

5211206621 is a deficient number, since it is larger than the sum of its proper divisors (41033251).

5211206621 is a wasteful number, since it uses less digits than its factorization.

5211206621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41033250.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 5211206621 is about 72188.6876248627. The cubic root of 5211206621 is about 1733.7218835020.

Adding to 5211206621 its reverse (1266021125), we get a palindrome (6477227746).

The spelling of 5211206621 in words is "five billion, two hundred eleven million, two hundred six thousand, six hundred twenty-one".