121556006 has 32 divisors (see below), whose sum is σ = 218792448. Its totient is φ = 49911840.

The previous prime is 121555961. The next prime is 121556009. The reversal of 121556006 is 600655121.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121556009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8921 + ... + 17963.

It is an arithmetic number, because the mean of its divisors is an integer number (6837264).

Almost surely, 2^121556006 is an apocalyptic number.

121556006 is a deficient number, since it is larger than the sum of its proper divisors (97236442).

121556006 is a wasteful number, since it uses less digits than its factorization.

121556006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9116.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 121556006 is about 11025.2440335804. The cubic root of 121556006 is about 495.3651775936.

The spelling of 121556006 in words is "one hundred twenty-one million, five hundred fifty-six thousand, six".