220121993 has 12 divisors (see below), whose sum is σ = 272409408. Its totient is φ = 174161520.

The previous prime is 220121987. The next prime is 220121999. The reversal of 220121993 is 399121022.

It is an interprime number because it is at equal distance from previous prime (220121987) and next prime (220121999).

It is not a de Polignac number, because 220121993 - 2²⁰ = 219073417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (220121999) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 91853 + ... + 94218.

It is an arithmetic number, because the mean of its divisors is an integer number (22700784).

Almost surely, 2^220121993 is an apocalyptic number.

It is an amenable number.

220121993 is a deficient number, since it is larger than the sum of its proper divisors (52287415).

220121993 is a wasteful number, since it uses less digits than its factorization.

220121993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186104 (or 186091 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 220121993 is about 14836.5087874473. The cubic root of 220121993 is about 603.7926361905.

The spelling of 220121993 in words is "two hundred twenty million, one hundred twenty-one thousand, nine hundred ninety-three".