1220051002521 has 16 divisors (see below), whose sum is σ = 1844071691840. Its totient is φ = 711284794560.

The previous prime is 1220051002517. The next prime is 1220051002529. The reversal of 1220051002521 is 1252001500221.

It is not a de Polignac number, because 1220051002521 - 2² = 1220051002517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220051002529) 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, 823245550 + ... + 823247031.

It is an arithmetic number, because the mean of its divisors is an integer number (115254480740).

Almost surely, 2^{1220051002521} is an apocalyptic number.

It is an amenable number.

1220051002521 is a deficient number, since it is larger than the sum of its proper divisors (624020689319).

1220051002521 is a wasteful number, since it uses less digits than its factorization.

1220051002521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1646492616.

The product of its (nonzero) digits is 400, while the sum is 21.

Adding to 1220051002521 its reverse (1252001500221), we get a palindrome (2472052502742).

The spelling of 1220051002521 in words is "one trillion, two hundred twenty billion, fifty-one million, two thousand, five hundred twenty-one".