121531340 has 24 divisors (see below), whose sum is σ = 291675552. Its totient is φ = 41667840.

The previous prime is 121531313. The next prime is 121531363. The reversal of 121531340 is 43135121.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 433901 + ... + 434180.

It is an arithmetic number, because the mean of its divisors is an integer number (12153148).

Almost surely, 2^121531340 is an apocalyptic number.

121531340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121531340 is an abundant number, since it is smaller than the sum of its proper divisors (170144212).

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

121531340 is a wasteful number, since it uses less digits than its factorization.

121531340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868097 (or 868095 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 121531340 is about 11024.1253621319. The cubic root of 121531340 is about 495.3316690230.

Adding to 121531340 its reverse (43135121), we get a palindrome (164666461).

The spelling of 121531340 in words is "one hundred twenty-one million, five hundred thirty-one thousand, three hundred forty".