121751554402 has 8 divisors (see below), whose sum is σ = 183116950236. Its totient is φ = 60712570992.

The previous prime is 121751554399. The next prime is 121751554433. The reversal of 121751554402 is 204455157121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 121439007361 + 312547041 = 348481^2 + 17679^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81602173 + ... + 81603664.

Almost surely, 2^121751554402 is an apocalyptic number.

121751554402 is a deficient number, since it is larger than the sum of its proper divisors (61365395834).

121751554402 is a wasteful number, since it uses less digits than its factorization.

121751554402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163206212.

The product of its (nonzero) digits is 56000, while the sum is 37.

The spelling of 121751554402 in words is "one hundred twenty-one billion, seven hundred fifty-one million, five hundred fifty-four thousand, four hundred two".