121720167 has 12 divisors (see below), whose sum is σ = 181489984. Its totient is φ = 78528960.

The previous prime is 121720133. The next prime is 121720201. The reversal of 121720167 is 761027121.

It is an interprime number because it is at equal distance from previous prime (121720133) and next prime (121720201).

It is not a de Polignac number, because 121720167 - 2¹⁸ = 121458023 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121720167.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121720967) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 217858 + ... + 218415.

Almost surely, 2^121720167 is an apocalyptic number.

121720167 is a deficient number, since it is larger than the sum of its proper divisors (59769817).

121720167 is a wasteful number, since it uses less digits than its factorization.

121720167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436310 (or 436307 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 27.

The square root of 121720167 is about 11032.6863002625. The cubic root of 121720167 is about 495.5880736498.

Adding to 121720167 its reverse (761027121), we get a palindrome (882747288).

The spelling of 121720167 in words is "one hundred twenty-one million, seven hundred twenty thousand, one hundred sixty-seven".