1240001542121 has 8 divisors (see below), whose sum is σ = 1362015424320. Its totient is φ = 1123662724272.

The previous prime is 1240001542103. The next prime is 1240001542151. The reversal of 1240001542121 is 1212451000421.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1240001542121 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1240001542151) 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, 1418765630 + ... + 1418766503.

It is an arithmetic number, because the mean of its divisors is an integer number (170251928040).

Almost surely, 2^{1240001542121} is an apocalyptic number.

It is an amenable number.

1240001542121 is a deficient number, since it is larger than the sum of its proper divisors (122013882199).

1240001542121 is a wasteful number, since it uses less digits than its factorization.

1240001542121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2837532175.

The product of its (nonzero) digits is 640, while the sum is 23.

Adding to 1240001542121 its reverse (1212451000421), we get a palindrome (2452452542542).

The spelling of 1240001542121 in words is "one trillion, two hundred forty billion, one million, five hundred forty-two thousand, one hundred twenty-one".