121667643 has 16 divisors (see below), whose sum is σ = 180896640. Its totient is φ = 80820072.

The previous prime is 121667641. The next prime is 121667647. The reversal of 121667643 is 346766121.

121667643 = T₃₅₂ + T₃₅₃ + ... + T₉₁₇.

It is a happy number.

121667643 is a `hidden beast` number, since 1 + 2 + 1 + 6 + 6 + 7 + 643 = 666.

It is not a de Polignac number, because 121667643 - 2¹ = 121667641 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 121667598 and 121667607.

It is not an unprimeable number, because it can be changed into a prime (121667641) 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, 321 + ... + 15602.

It is an arithmetic number, because the mean of its divisors is an integer number (11306040).

Almost surely, 2^121667643 is an apocalyptic number.

121667643 is a deficient number, since it is larger than the sum of its proper divisors (59228997).

121667643 is a wasteful number, since it uses less digits than its factorization.

121667643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16215 (or 16209 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 121667643 is about 11030.3056621292. The cubic root of 121667643 is about 495.5167789371.

The spelling of 121667643 in words is "one hundred twenty-one million, six hundred sixty-seven thousand, six hundred forty-three".