243121215051 has 48 divisors (see below), whose sum is σ = 412631043552. Its totient is φ = 135991526400.

The previous prime is 243121215011. The next prime is 243121215083. The reversal of 243121215051 is 150512121342.

It is a happy number.

243121215051 is a `hidden beast` number, since 2 + 4 + 31 + 2 + 121 + 505 + 1 = 666.

It is not a de Polignac number, because 243121215051 - 2¹⁰ = 243121214027 is a prime.

It is a super-3 number, since 3×243121215051³ (a number of 35 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (243121215011) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13969411 + ... + 13986803.

It is an arithmetic number, because the mean of its divisors is an integer number (8596480074).

Almost surely, 2^243121215051 is an apocalyptic number.

243121215051 is a deficient number, since it is larger than the sum of its proper divisors (169509828501).

243121215051 is a wasteful number, since it uses less digits than its factorization.

243121215051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28284 (or 28281 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

Adding to 243121215051 its reverse (150512121342), we get a palindrome (393633336393).

The spelling of 243121215051 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred fifteen thousand, fifty-one".