121686207478 has 32 divisors (see below), whose sum is σ = 201060200448. Its totient is φ = 54775375200.

The previous prime is 121686207463. The next prime is 121686207493. The reversal of 121686207478 is 874702686121.

It is an interprime number because it is at equal distance from previous prime (121686207463) and next prime (121686207493).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1488508 + ... + 1568128.

It is an arithmetic number, because the mean of its divisors is an integer number (6283131264).

Almost surely, 2^121686207478 is an apocalyptic number.

121686207478 is a deficient number, since it is larger than the sum of its proper divisors (79373992970).

121686207478 is a wasteful number, since it uses less digits than its factorization.

121686207478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80308.

The product of its (nonzero) digits is 1806336, while the sum is 52.

The spelling of 121686207478 in words is "one hundred twenty-one billion, six hundred eighty-six million, two hundred seven thousand, four hundred seventy-eight".