121521550 has 24 divisors (see below), whose sum is σ = 233324352. Its totient is φ = 47040000.

The previous prime is 121521529. The next prime is 121521583. The reversal of 121521550 is 55125121.

It is a happy number.

It is a super-2 number, since 2×121521550² = 29534974228805000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37651 + ... + 40750.

It is an arithmetic number, because the mean of its divisors is an integer number (9721848).

Almost surely, 2^121521550 is an apocalyptic number.

121521550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121521550 is a deficient number, since it is larger than the sum of its proper divisors (111802802).

121521550 is a wasteful number, since it uses less digits than its factorization.

121521550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78444 (or 78439 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 22.

The square root of 121521550 is about 11023.6813270341. The cubic root of 121521550 is about 495.3183681267.

Adding to 121521550 its reverse (55125121), we get a palindrome (176646671).

It can be divided in two parts, 12152 and 1550, that multiplied together give a square (18835600 = 4340²).

The spelling of 121521550 in words is "one hundred twenty-one million, five hundred twenty-one thousand, five hundred fifty".