1240545532121 has 4 divisors (see below), whose sum is σ = 1417766322432. Its totient is φ = 1063324741812.

The previous prime is 1240545532097. The next prime is 1240545532123. The reversal of 1240545532121 is 1212355450421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1240545532121 - 2¹⁰ = 1240545531097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1240545532123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88610395145 + ... + 88610395158.

It is an arithmetic number, because the mean of its divisors is an integer number (354441580608).

Almost surely, 2^{1240545532121} is an apocalyptic number.

It is an amenable number.

1240545532121 is a deficient number, since it is larger than the sum of its proper divisors (177220790311).

1240545532121 is an equidigital number, since it uses as much as digits as its factorization.

1240545532121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177220790310.

The product of its (nonzero) digits is 48000, while the sum is 35.

The spelling of 1240545532121 in words is "one trillion, two hundred forty billion, five hundred forty-five million, five hundred thirty-two thousand, one hundred twenty-one".