121615730 has 8 divisors (see below), whose sum is σ = 218908332. Its totient is φ = 48646288.

The previous prime is 121615723. The next prime is 121615733. The reversal of 121615730 is 37516121.

It can be written as a sum of positive squares in 2 ways, for example, as 113188321 + 8427409 = 10639^2 + 2903^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 121615730.

It is not an unprimeable number, because it can be changed into a prime (121615733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6080777 + ... + 6080796.

Almost surely, 2^121615730 is an apocalyptic number.

121615730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121615730 is a deficient number, since it is larger than the sum of its proper divisors (97292602).

121615730 is a wasteful number, since it uses less digits than its factorization.

121615730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12161580.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 121615730 is about 11027.9522124463. The cubic root of 121615730 is about 495.4462934150.

The spelling of 121615730 in words is "one hundred twenty-one million, six hundred fifteen thousand, seven hundred thirty".