121550400399 has 16 divisors (see below), whose sum is σ = 162619591680. Its totient is φ = 80757800640.

The previous prime is 121550400347. The next prime is 121550400431. The reversal of 121550400399 is 993004055121.

It is not a de Polignac number, because 121550400399 - 2¹¹ = 121550398351 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121550402399) 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, 1196899 + ... + 1294475.

It is an arithmetic number, because the mean of its divisors is an integer number (10163724480).

Almost surely, 2^121550400399 is an apocalyptic number.

121550400399 is a deficient number, since it is larger than the sum of its proper divisors (41069191281).

121550400399 is an equidigital number, since it uses as much as digits as its factorization.

121550400399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98990.

The product of its (nonzero) digits is 48600, while the sum is 39.

The spelling of 121550400399 in words is "one hundred twenty-one billion, five hundred fifty million, four hundred thousand, three hundred ninety-nine".