1520121101243 has 4 divisors (see below), whose sum is σ = 1522129188000. Its totient is φ = 1518113014488.

The previous prime is 1520121101237. The next prime is 1520121101249. The reversal of 1520121101243 is 3421011210251.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1520121101237) and next prime (1520121101249).

It is a cyclic number.

It is not a de Polignac number, because 1520121101243 - 2¹⁶ = 1520121035707 is a prime.

It is a super-2 number, since 2×1520121101243² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1520121101249) 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, 1004042243 + ... + 1004043756.

It is an arithmetic number, because the mean of its divisors is an integer number (380532297000).

Almost surely, 2^{1520121101243} is an apocalyptic number.

1520121101243 is a deficient number, since it is larger than the sum of its proper divisors (2008086757).

1520121101243 is an equidigital number, since it uses as much as digits as its factorization.

1520121101243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2008086756.

The product of its (nonzero) digits is 480, while the sum is 23.

Adding to 1520121101243 its reverse (3421011210251), we get a palindrome (4941132311494).

The spelling of 1520121101243 in words is "one trillion, five hundred twenty billion, one hundred twenty-one million, one hundred one thousand, two hundred forty-three".