121681740 has 48 divisors (see below), whose sum is σ = 341671680. Its totient is φ = 32356800.

The previous prime is 121681739. The next prime is 121681741. The reversal of 121681740 is 47186121.

It is an interprime number because it is at equal distance from previous prime (121681739) and next prime (121681741).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 121681698 and 121681707.

It is not an unprimeable number, because it can be changed into a prime (121681741) 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, 20065 + ... + 25415.

It is an arithmetic number, because the mean of its divisors is an integer number (7118160).

Almost surely, 2^121681740 is an apocalyptic number.

121681740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121681740 is an abundant number, since it is smaller than the sum of its proper divisors (219989940).

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

121681740 is a wasteful number, since it uses less digits than its factorization.

121681740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5742 (or 5740 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 121681740 is about 11030.9446558307. The cubic root of 121681740 is about 495.5359158528.

The spelling of 121681740 in words is "one hundred twenty-one million, six hundred eighty-one thousand, seven hundred forty".