6621152101 has 2 divisors, whose sum is σ = 6621152102. Its totient is φ = 6621152100.

The previous prime is 6621152099. The next prime is 6621152141. The reversal of 6621152101 is 1012511266.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6086340225 + 534811876 = 78015^2 + 23126^2 .

It is a cyclic number.

It is not a de Polignac number, because 6621152101 - 2¹ = 6621152099 is a prime.

Together with 6621152099, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6621152141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3310576050 + 3310576051.

It is an arithmetic number, because the mean of its divisors is an integer number (3310576051).

Almost surely, 2^6621152101 is an apocalyptic number.

It is an amenable number.

6621152101 is a deficient number, since it is larger than the sum of its proper divisors (1).

6621152101 is an equidigital number, since it uses as much as digits as its factorization.

6621152101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 6621152101 is about 81370.4620915968. The cubic root of 6621152101 is about 1877.7791888733.

Adding to 6621152101 its reverse (1012511266), we get a palindrome (7633663367).

The spelling of 6621152101 in words is "six billion, six hundred twenty-one million, one hundred fifty-two thousand, one hundred one".