121399471 has 4 divisors (see below), whose sum is σ = 122763600. Its totient is φ = 120035344.

The previous prime is 121399459. The next prime is 121399501. The reversal of 121399471 is 174993121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121399471 is a prime.

It is a super-3 number, since 3×121399471³ (a number of 25 digits) contains 333 as substring.

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 121399471.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121349471) 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, 681931 + ... + 682108.

It is an arithmetic number, because the mean of its divisors is an integer number (30690900).

Almost surely, 2^121399471 is an apocalyptic number.

121399471 is a deficient number, since it is larger than the sum of its proper divisors (1364129).

121399471 is an equidigital number, since it uses as much as digits as its factorization.

121399471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1364128.

The product of its digits is 13608, while the sum is 37.

The square root of 121399471 is about 11018.1428108370. The cubic root of 121399471 is about 495.1524490481.

The spelling of 121399471 in words is "one hundred twenty-one million, three hundred ninety-nine thousand, four hundred seventy-one".