1240143812921 has 8 divisors (see below), whose sum is σ = 1335550569864. Its totient is φ = 1144738638720.

The previous prime is 1240143812917. The next prime is 1240143812959. The reversal of 1240143812921 is 1292183410421.

It can be written as a sum of positive squares in 4 ways, for example, as 5069440000 + 1235074372921 = 71200^2 + 1111339^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1240143812921 - 2² = 1240143812917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1240143812821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1607195 + ... + 2250191.

It is an arithmetic number, because the mean of its divisors is an integer number (166943821233).

Almost surely, 2^{1240143812921} is an apocalyptic number.

It is an amenable number.

1240143812921 is a deficient number, since it is larger than the sum of its proper divisors (95406756943).

1240143812921 is a wasteful number, since it uses less digits than its factorization.

1240143812921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 791371.

The product of its (nonzero) digits is 27648, while the sum is 38.

The spelling of 1240143812921 in words is "one trillion, two hundred forty billion, one hundred forty-three million, eight hundred twelve thousand, nine hundred twenty-one".