121670556 has 48 divisors (see below), whose sum is σ = 327511296. Its totient is φ = 34435584.

The previous prime is 121670551. The next prime is 121670557. The reversal of 121670556 is 655076121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121670551) 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, 2220 + ... + 15756.

It is an arithmetic number, because the mean of its divisors is an integer number (6823152).

Almost surely, 2^121670556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121670556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (163755648).

121670556 is an abundant number, since it is smaller than the sum of its proper divisors (205840740).

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

121670556 is a wasteful number, since it uses less digits than its factorization.

121670556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13658 (or 13656 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 121670556 is about 11030.4377066370. The cubic root of 121670556 is about 495.5207335050.

The spelling of 121670556 in words is "one hundred twenty-one million, six hundred seventy thousand, five hundred fifty-six".