121361204550 has 48 divisors (see below), whose sum is σ = 301532321232. Its totient is φ = 32303145600.

The previous prime is 121361204537. The next prime is 121361204581. The reversal of 121361204550 is 55402163121.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 666609 + ... + 828908.

It is an arithmetic number, because the mean of its divisors is an integer number (6281923359).

Almost surely, 2^121361204550 is an apocalyptic number.

121361204550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121361204550 is an abundant number, since it is smaller than the sum of its proper divisors (180171116682).

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

121361204550 is a wasteful number, since it uses less digits than its factorization.

121361204550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1496073 (or 1496068 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

Adding to 121361204550 its reverse (55402163121), we get a palindrome (176763367671).

The spelling of 121361204550 in words is "one hundred twenty-one billion, three hundred sixty-one million, two hundred four thousand, five hundred fifty".