1207517221 has 4 divisors (see below), whose sum is σ = 1207597612. Its totient is φ = 1207436832.

The previous prime is 1207517197. The next prime is 1207517249. The reversal of 1207517221 is 1227157021.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1227157021 = 27191 ⋅45131.

It can be written as a sum of positive squares in 2 ways, for example, as 484660225 + 722856996 = 22015^2 + 26886^2 .

It is a cyclic number.

It is not a de Polignac number, because 1207517221 - 2⁵ = 1207517189 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1207517221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1207512221) 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, 10206 + ... + 50191.

It is an arithmetic number, because the mean of its divisors is an integer number (301899403).

Almost surely, 2^1207517221 is an apocalyptic number.

It is an amenable number.

1207517221 is a deficient number, since it is larger than the sum of its proper divisors (80391).

1207517221 is an equidigital number, since it uses as much as digits as its factorization.

1207517221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80390.

The product of its (nonzero) digits is 1960, while the sum is 28.

The square root of 1207517221 is about 34749.3484974898. The cubic root of 1207517221 is about 1064.8729071670.

The spelling of 1207517221 in words is "one billion, two hundred seven million, five hundred seventeen thousand, two hundred twenty-one".