1521320220404 has 12 divisors (see below), whose sum is σ = 2662334224704. Its totient is φ = 760653299064.

The previous prime is 1521320220337. The next prime is 1521320220439. The reversal of 1521320220404 is 4040220231251.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1182572 + ... + 2107395.

It is an arithmetic number, because the mean of its divisors is an integer number (221861185392).

Almost surely, 2^{1521320220404} is an apocalyptic number.

It is an amenable number.

1521320220404 is a deficient number, since it is larger than the sum of its proper divisors (1141014004300).

1521320220404 is a wasteful number, since it uses less digits than its factorization.

1521320220404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3405574 (or 3405572 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 1521320220404 its reverse (4040220231251), we get a palindrome (5561540451655).

The spelling of 1521320220404 in words is "one trillion, five hundred twenty-one billion, three hundred twenty million, two hundred twenty thousand, four hundred four".