121961390 has 16 divisors (see below), whose sum is σ = 219823632. Its totient is φ = 48719424.

The previous prime is 121961377. The next prime is 121961401. The reversal of 121961390 is 93169121.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122 + ... + 15618.

It is an arithmetic number, because the mean of its divisors is an integer number (13738977).

Almost surely, 2^121961390 is an apocalyptic number.

121961390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121961390 is a deficient number, since it is larger than the sum of its proper divisors (97862242).

121961390 is a wasteful number, since it uses less digits than its factorization.

121961390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16291.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 121961390 is about 11043.6130863047. The cubic root of 121961390 is about 495.9152403509.

The spelling of 121961390 in words is "one hundred twenty-one million, nine hundred sixty-one thousand, three hundred ninety".