121283921 has 8 divisors (see below), whose sum is σ = 134479488. Its totient is φ = 108450000.

The previous prime is 121283909. The next prime is 121283957. The reversal of 121283921 is 129382121.

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

It is a cyclic number.

It is not a de Polignac number, because 121283921 - 2¹⁰ = 121282897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121283621) 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, 89705 + ... + 91046.

It is an arithmetic number, because the mean of its divisors is an integer number (16809936).

Almost surely, 2^121283921 is an apocalyptic number.

121283921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121283921 is a deficient number, since it is larger than the sum of its proper divisors (13195567).

121283921 is a wasteful number, since it uses less digits than its factorization.

121283921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180823.

The product of its digits is 1728, while the sum is 29.

The square root of 121283921 is about 11012.8979383267. The cubic root of 121283921 is about 494.9953011151.

The spelling of 121283921 in words is "one hundred twenty-one million, two hundred eighty-three thousand, nine hundred twenty-one".