7121217137 has 4 divisors (see below), whose sum is σ = 7121427696. Its totient is φ = 7121006580.

The previous prime is 7121217097. The next prime is 7121217149. The reversal of 7121217137 is 7317121217.

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 7121217137 - 2⁸ = 7121216881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7121217437) 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, 41783 + ... + 126444.

It is an arithmetic number, because the mean of its divisors is an integer number (1780356924).

Almost surely, 2^7121217137 is an apocalyptic number.

It is an amenable number.

7121217137 is a deficient number, since it is larger than the sum of its proper divisors (210559).

7121217137 is a wasteful number, since it uses less digits than its factorization.

7121217137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210558.

The product of its digits is 4116, while the sum is 32.

The square root of 7121217137 is about 84387.3043591274. The cubic root of 7121217137 is about 1923.9099590940.

The spelling of 7121217137 in words is "seven billion, one hundred twenty-one million, two hundred seventeen thousand, one hundred thirty-seven".