121686207477 has 16 divisors (see below), whose sum is σ = 164539452288. Its totient is φ = 79979477760.

The previous prime is 121686207463. The next prime is 121686207493. The reversal of 121686207477 is 774702686121.

It is not a de Polignac number, because 121686207477 - 2⁸ = 121686207221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121686407477) 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, 415977 + ... + 645297.

It is an arithmetic number, because the mean of its divisors is an integer number (10283715768).

Almost surely, 2^121686207477 is an apocalyptic number.

It is an amenable number.

121686207477 is a deficient number, since it is larger than the sum of its proper divisors (42853244811).

121686207477 is a wasteful number, since it uses less digits than its factorization.

121686207477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231820.

The product of its (nonzero) digits is 1580544, while the sum is 51.

The spelling of 121686207477 in words is "one hundred twenty-one billion, six hundred eighty-six million, two hundred seven thousand, four hundred seventy-seven".