121991330 has 8 divisors (see below), whose sum is σ = 219584412. Its totient is φ = 48796528.

The previous prime is 121991323. The next prime is 121991339. The reversal of 121991330 is 33199121.

It can be written as a sum of positive squares in 2 ways, for example, as 120582361 + 1408969 = 10981^2 + 1187^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 121991293 and 121991302.

It is not an unprimeable number, because it can be changed into a prime (121991339) 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, 6099557 + ... + 6099576.

Almost surely, 2^121991330 is an apocalyptic number.

121991330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121991330 is a deficient number, since it is larger than the sum of its proper divisors (97593082).

121991330 is a wasteful number, since it uses less digits than its factorization.

121991330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12199140.

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 121991330 is about 11044.9685377551. The cubic root of 121991330 is about 495.9558173660.

The spelling of 121991330 in words is "one hundred twenty-one million, nine hundred ninety-one thousand, three hundred thirty".