1220242044021 has 64 divisors (see below), whose sum is σ = 2187187193856. Its totient is φ = 584408390400.

The previous prime is 1220242044019. The next prime is 1220242044023. The reversal of 1220242044021 is 1204402420221.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1220242044019) and next prime (1220242044023).

It is not a de Polignac number, because 1220242044021 - 2¹ = 1220242044019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220242043982 and 1220242044000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220242044023) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2184915 + ... + 2685951.

It is an arithmetic number, because the mean of its divisors is an integer number (34174799904).

Almost surely, 2^{1220242044021} is an apocalyptic number.

1220242044021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1220242044021 is a deficient number, since it is larger than the sum of its proper divisors (966945149835).

1220242044021 is a wasteful number, since it uses less digits than its factorization.

1220242044021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501882.

The product of its (nonzero) digits is 2048, while the sum is 24.

Adding to 1220242044021 its reverse (1204402420221), we get a palindrome (2424644464242).

The spelling of 1220242044021 in words is "one trillion, two hundred twenty billion, two hundred forty-two million, forty-four thousand, twenty-one".