121006556 has 24 divisors (see below), whose sum is σ = 234466176. Its totient is φ = 54180720.

The previous prime is 121006553. The next prime is 121006583. The reversal of 121006556 is 655600121.

It is a super-2 number, since 2×121006556² = 29285173189962272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121006553) 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, 17576 + ... + 23471.

It is an arithmetic number, because the mean of its divisors is an integer number (9769424).

Almost surely, 2^121006556 is an apocalyptic number.

It is an amenable number.

121006556 is a deficient number, since it is larger than the sum of its proper divisors (113459620).

121006556 is a wasteful number, since it uses less digits than its factorization.

121006556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41129 (or 41127 counting only the distinct ones).

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

The square root of 121006556 is about 11000.2979959636. The cubic root of 121006556 is about 494.6176770972.

Adding to 121006556 its reverse (655600121), we get a palindrome (776606677).

It can be divided in two parts, 1210065 and 56, that added together give a palindrome (1210121).

The spelling of 121006556 in words is "one hundred twenty-one million, six thousand, five hundred fifty-six".