121201993 has 16 divisors (see below), whose sum is σ = 143263296. Its totient is φ = 101283840.

The previous prime is 121201981. The next prime is 121202017. The reversal of 121201993 is 399102121.

It is a cyclic number.

It is not a de Polignac number, because 121201993 - 2⁹ = 121201481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121201903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 505 + ... + 15577.

It is an arithmetic number, because the mean of its divisors is an integer number (8953956).

Almost surely, 2^121201993 is an apocalyptic number.

It is an amenable number.

121201993 is a deficient number, since it is larger than the sum of its proper divisors (22061303).

121201993 is a wasteful number, since it uses less digits than its factorization.

121201993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15144.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 121201993 is about 11009.1776713795. The cubic root of 121201993 is about 494.8838185993.

The spelling of 121201993 in words is "one hundred twenty-one million, two hundred one thousand, nine hundred ninety-three".