1020001212221 has 4 divisors (see below), whose sum is σ = 1020009330912. Its totient is φ = 1019993093532.

The previous prime is 1020001212211. The next prime is 1020001212233. The reversal of 1020001212221 is 1222121000201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1020001212221 - 2³⁴ = 1002821343037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020001212196 and 1020001212205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020001212211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3867881 + ... + 4123166.

It is an arithmetic number, because the mean of its divisors is an integer number (255002332728).

Almost surely, 2^{1020001212221} is an apocalyptic number.

It is an amenable number.

1020001212221 is a deficient number, since it is larger than the sum of its proper divisors (8118691).

1020001212221 is an equidigital number, since it uses as much as digits as its factorization.

1020001212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8118690.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1020001212221 its reverse (1222121000201), we get a palindrome (2242122212422).

The spelling of 1020001212221 in words is "one trillion, twenty billion, one million, two hundred twelve thousand, two hundred twenty-one".