1520121233642 has 64 divisors (see below), whose sum is σ = 2711385740160. Its totient is φ = 636905047680.

The previous prime is 1520121233633. The next prime is 1520121233647. The reversal of 1520121233642 is 2463321210251.

It is a junction number, because it is equal to n+sod(n) for n = 1520121233599 and 1520121233608.

It is not an unprimeable number, because it can be changed into a prime (1520121233647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1465238 + ... + 2277534.

It is an arithmetic number, because the mean of its divisors is an integer number (42365402190).

Almost surely, 2^{1520121233642} is an apocalyptic number.

1520121233642 is a deficient number, since it is larger than the sum of its proper divisors (1191264506518).

1520121233642 is a wasteful number, since it uses less digits than its factorization.

1520121233642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812388 (or 812366 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

Adding to 1520121233642 its reverse (2463321210251), we get a palindrome (3983442443893).

The spelling of 1520121233642 in words is "one trillion, five hundred twenty billion, one hundred twenty-one million, two hundred thirty-three thousand, six hundred forty-two".