1020221200021 has 64 divisors (see below), whose sum is σ = 1111743037440. Its totient is φ = 934487953920.

The previous prime is 1020221199997. The next prime is 1020221200057. The reversal of 1020221200021 is 1200021220201.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020221200021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020221199974 and 1020221200010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020221200081) 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, 1438957615 + ... + 1438958323.

It is an arithmetic number, because the mean of its divisors is an integer number (17370984960).

Almost surely, 2^{1020221200021} is an apocalyptic number.

It is an amenable number.

1020221200021 is a deficient number, since it is larger than the sum of its proper divisors (91521837419).

1020221200021 is a wasteful number, since it uses less digits than its factorization.

1020221200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1106.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1020221200021 its reverse (1200021220201), we get a palindrome (2220242420222).

The spelling of 1020221200021 in words is "one trillion, twenty billion, two hundred twenty-one million, two hundred thousand, twenty-one".