121781673 has 24 divisors (see below), whose sum is σ = 189949760. Its totient is φ = 74740320.

The previous prime is 121781663. The next prime is 121781677. The reversal of 121781673 is 376187121.

It is not a de Polignac number, because 121781673 - 2¹³ = 121773481 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 Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121781677) 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, 50178 + ... + 52548.

Almost surely, 2^121781673 is an apocalyptic number.

121781673 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

121781673 is a deficient number, since it is larger than the sum of its proper divisors (68168087).

121781673 is a wasteful number, since it uses less digits than its factorization.

121781673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2829 (or 2826 counting only the distinct ones).

The product of its digits is 14112, while the sum is 36.

The square root of 121781673 is about 11035.4733926552. The cubic root of 121781673 is about 495.6715342301.

The spelling of 121781673 in words is "one hundred twenty-one million, seven hundred eighty-one thousand, six hundred seventy-three".