121678563630 has 32 divisors (see below), whose sum is σ = 314492288544. Its totient is φ = 29951646336.

The previous prime is 121678563593. The next prime is 121678563637. The reversal of 121678563630 is 36365876121.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 121678563630.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121678563637) 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, 155997769 + ... + 155998548.

It is an arithmetic number, because the mean of its divisors is an integer number (9827884017).

Almost surely, 2^121678563630 is an apocalyptic number.

121678563630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121678563630 is an abundant number, since it is smaller than the sum of its proper divisors (192813724914).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121678563630 is a wasteful number, since it uses less digits than its factorization.

121678563630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311996340.

The product of its (nonzero) digits is 1088640, while the sum is 48.

The spelling of 121678563630 in words is "one hundred twenty-one billion, six hundred seventy-eight million, five hundred sixty-three thousand, six hundred thirty".