7741868921 has 4 divisors (see below), whose sum is σ = 7742101392. Its totient is φ = 7741636452.

The previous prime is 7741868887. The next prime is 7741868929. The reversal of 7741868921 is 1298681477.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1298681477 = 3793 ⋅342389.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7741868921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7741868929) 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, 55811 + ... + 136376.

It is an arithmetic number, because the mean of its divisors is an integer number (1935525348).

Almost surely, 2^7741868921 is an apocalyptic number.

It is an amenable number.

7741868921 is a deficient number, since it is larger than the sum of its proper divisors (232471).

7741868921 is a wasteful number, since it uses less digits than its factorization.

7741868921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232470.

The product of its digits is 1354752, while the sum is 53.

The square root of 7741868921 is about 87987.8907634454. The cubic root of 7741868921 is about 1978.2534781584.

The spelling of 7741868921 in words is "seven billion, seven hundred forty-one million, eight hundred sixty-eight thousand, nine hundred twenty-one".