1220101200021 has 64 divisors (see below), whose sum is σ = 1796921508096. Its totient is φ = 730272153600.

The previous prime is 1220101199987. The next prime is 1220101200023. The reversal of 1220101200021 is 1200021010221.

It is not a de Polignac number, because 1220101200021 - 2⁹ = 1220101199509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220101200023) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 513293385 + ... + 513295761.

It is an arithmetic number, because the mean of its divisors is an integer number (28076898564).

Almost surely, 2^{1220101200021} is an apocalyptic number.

1220101200021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1220101200021 is a deficient number, since it is larger than the sum of its proper divisors (576820308075).

1220101200021 is a wasteful number, since it uses less digits than its factorization.

1220101200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3142.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1220101200021 its reverse (1200021010221), we get a palindrome (2420122210242).

The spelling of 1220101200021 in words is "one trillion, two hundred twenty billion, one hundred one million, two hundred thousand, twenty-one".