117557421 has 4 divisors (see below), whose sum is σ = 156743232. Its totient is φ = 78371612.

The previous prime is 117557383. The next prime is 117557449. The reversal of 117557421 is 124755711.

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 117557421 - 2¹⁴ = 117541037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117557471) 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, 19592901 + ... + 19592906.

It is an arithmetic number, because the mean of its divisors is an integer number (39185808).

Almost surely, 2^117557421 is an apocalyptic number.

It is an amenable number.

117557421 is a deficient number, since it is larger than the sum of its proper divisors (39185811).

117557421 is an equidigital number, since it uses as much as digits as its factorization.

117557421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39185810.

The product of its digits is 9800, while the sum is 33.

The square root of 117557421 is about 10842.3900040535. The cubic root of 117557421 is about 489.8728269162.

The spelling of 117557421 in words is "one hundred seventeen million, five hundred fifty-seven thousand, four hundred twenty-one".