121100661 has 24 divisors (see below), whose sum is σ = 200871840. Its totient is φ = 69530400.

The previous prime is 121100647. The next prime is 121100671. The reversal of 121100661 is 166001121.

121100661 is a `hidden beast` number, since 1 + 2 + 1 + 1 + 0 + 0 + 661 = 666.

It is not a de Polignac number, because 121100661 - 2⁶ = 121100597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121100611) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30310 + ... + 34071.

It is an arithmetic number, because the mean of its divisors is an integer number (8369660).

Almost surely, 2^121100661 is an apocalyptic number.

121100661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121100661 is a deficient number, since it is larger than the sum of its proper divisors (79771179).

121100661 is a wasteful number, since it uses less digits than its factorization.

121100661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64417 (or 64414 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 121100661 is about 11004.5745487956. The cubic root of 121100661 is about 494.7458628121.

Adding to 121100661 its reverse (166001121), we get a palindrome (287101782).

The spelling of 121100661 in words is "one hundred twenty-one million, one hundred thousand, six hundred sixty-one".