7216621727261 has 4 divisors (see below), whose sum is σ = 7217026559232. Its totient is φ = 7216216895292.

The previous prime is 7216621727257. The next prime is 7216621727299. The reversal of 7216621727261 is 1627271266127.

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 7216621727261 - 2² = 7216621727257 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 (7216621727761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202389245 + ... + 202424898.

It is an arithmetic number, because the mean of its divisors is an integer number (1804256639808).

Almost surely, 2^{7216621727261} is an apocalyptic number.

It is an amenable number.

7216621727261 is a deficient number, since it is larger than the sum of its proper divisors (404831971).

7216621727261 is a wasteful number, since it uses less digits than its factorization.

7216621727261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404831970.

The product of its digits is 1185408, while the sum is 50.

The spelling of 7216621727261 in words is "seven trillion, two hundred sixteen billion, six hundred twenty-one million, seven hundred twenty-seven thousand, two hundred sixty-one".