121661403 has 8 divisors (see below), whose sum is σ = 163454016. Its totient is φ = 80488200.

The previous prime is 121661399. The next prime is 121661429. The reversal of 121661403 is 304166121.

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

It is not a de Polignac number, because 121661403 - 2² = 121661399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121661443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154393 + ... + 155178.

It is an arithmetic number, because the mean of its divisors is an integer number (20431752).

Almost surely, 2^121661403 is an apocalyptic number.

121661403 is a deficient number, since it is larger than the sum of its proper divisors (41792613).

121661403 is a wasteful number, since it uses less digits than its factorization.

121661403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309705.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 121661403 is about 11030.0228014270. The cubic root of 121661403 is about 495.5083075597.

The spelling of 121661403 in words is "one hundred twenty-one million, six hundred sixty-one thousand, four hundred three".