1220221200021 has 8 divisors (see below), whose sum is σ = 1627043844864. Its totient is φ = 813439677600.

The previous prime is 1220221200017. The next prime is 1220221200059. The reversal of 1220221200021 is 1200021220221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1220221200021 - 2² = 1220221200017 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220221207021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10211301 + ... + 10330106.

It is an arithmetic number, because the mean of its divisors is an integer number (203380480608).

Almost surely, 2^{1220221200021} is an apocalyptic number.

It is an amenable number.

1220221200021 is a deficient number, since it is larger than the sum of its proper divisors (406822644843).

1220221200021 is a wasteful number, since it uses less digits than its factorization.

1220221200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20561211.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 1220221200021 its reverse (1200021220221), we get a palindrome (2420242420242).

The spelling of 1220221200021 in words is "one trillion, two hundred twenty billion, two hundred twenty-one million, two hundred thousand, twenty-one".