121201940 has 48 divisors (see below), whose sum is σ = 264176640. Its totient is φ = 46659840.

The previous prime is 121201903. The next prime is 121201943. The reversal of 121201940 is 49102121.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121201943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144041 + ... + 144879.

It is an arithmetic number, because the mean of its divisors is an integer number (5503680).

Almost surely, 2^121201940 is an apocalyptic number.

121201940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121201940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132088320).

121201940 is an abundant number, since it is smaller than the sum of its proper divisors (142974700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121201940 is a wasteful number, since it uses less digits than its factorization.

121201940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112 (or 1110 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 121201940 is about 11009.1752642966. The cubic root of 121201940 is about 494.8837464639.

The spelling of 121201940 in words is "one hundred twenty-one million, two hundred one thousand, nine hundred forty".