1220410021521 has 16 divisors (see below), whose sum is σ = 1654848011520. Its totient is φ = 799790269200.

The previous prime is 1220410021477. The next prime is 1220410021561. The reversal of 1220410021521 is 1251200140221.

It is not a de Polignac number, because 1220410021521 - 2²⁹ = 1219873150609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1220410021561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6249466 + ... + 6441788.

It is an arithmetic number, because the mean of its divisors is an integer number (103428000720).

Almost surely, 2^{1220410021521} is an apocalyptic number.

It is an amenable number.

1220410021521 is a deficient number, since it is larger than the sum of its proper divisors (434437989999).

1220410021521 is a wasteful number, since it uses less digits than its factorization.

1220410021521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228236.

The product of its (nonzero) digits is 320, while the sum is 21.

Adding to 1220410021521 its reverse (1251200140221), we get a palindrome (2471610161742).

The spelling of 1220410021521 in words is "one trillion, two hundred twenty billion, four hundred ten million, twenty-one thousand, five hundred twenty-one".