121939221 has 8 divisors (see below), whose sum is σ = 163357024. Its totient is φ = 80907120.

The previous prime is 121939217. The next prime is 121939241. The reversal of 121939221 is 122939121.

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

It is not a de Polignac number, because 121939221 - 2² = 121939217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121939241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95686 + ... + 96951.

It is an arithmetic number, because the mean of its divisors is an integer number (20419628).

Almost surely, 2^121939221 is an apocalyptic number.

It is an amenable number.

121939221 is a deficient number, since it is larger than the sum of its proper divisors (41417803).

121939221 is a wasteful number, since it uses less digits than its factorization.

121939221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192851.

The product of its digits is 1944, while the sum is 30.

The square root of 121939221 is about 11042.6093383765. The cubic root of 121939221 is about 495.8851909198.

The spelling of 121939221 in words is "one hundred twenty-one million, nine hundred thirty-nine thousand, two hundred twenty-one".