1021220000001 has 20 divisors (see below), whose sum is σ = 1525619805424. Its totient is φ = 680771547000.

The previous prime is 1021219999993. The next prime is 1021220000111. The reversal of 1021220000001 is 1000000221201.

It is not a de Polignac number, because 1021220000001 - 2³ = 1021219999993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021220002001) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 970146 + ... + 1727316.

Almost surely, 2^{1021220000001} is an apocalyptic number.

It is an amenable number.

1021220000001 is a deficient number, since it is larger than the sum of its proper divisors (504399805423).

1021220000001 is an equidigital number, since it uses as much as digits as its factorization.

1021220000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773834 (or 773825 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 1021220000001 its reverse (1000000221201), we get a palindrome (2021220221202).

The spelling of 1021220000001 in words is "one trillion, twenty-one billion, two hundred twenty million, one", and thus it is an aban number.