7734147221 has 4 divisors (see below), whose sum is σ = 7843078944. Its totient is φ = 7625215500.

The previous prime is 7734147209. The next prime is 7734147283. The reversal of 7734147221 is 1227414377.

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 a de Polignac number, because none of the positive numbers 2^k-7734147221 is a prime.

It is a super-2 number, since 2×7734147221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7734117221) 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, 54465755 + ... + 54465896.

It is an arithmetic number, because the mean of its divisors is an integer number (1960769736).

Almost surely, 2^7734147221 is an apocalyptic number.

7734147221 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

It is an amenable number.

7734147221 is a deficient number, since it is larger than the sum of its proper divisors (108931723).

7734147221 is a wasteful number, since it uses less digits than its factorization.

7734147221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108931722.

The product of its digits is 65856, while the sum is 38.

The square root of 7734147221 is about 87944.0004832621. Note that the first 3 decimals coincide. The cubic root of 7734147221 is about 1977.5955594476.

The spelling of 7734147221 in words is "seven billion, seven hundred thirty-four million, one hundred forty-seven thousand, two hundred twenty-one".