1021212220201 has 8 divisors (see below), whose sum is σ = 1043332776360. Its totient is φ = 999328247808.

The previous prime is 1021212220183. The next prime is 1021212220271. The reversal of 1021212220201 is 1020222121201.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 134818214976 + 886394005225 = 367176^2 + 941485^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1021212220201 - 2⁷ = 1021212220073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021212220271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59137216 + ... + 59154481.

It is an arithmetic number, because the mean of its divisors is an integer number (130416597045).

Almost surely, 2^{1021212220201} is an apocalyptic number.

It is an amenable number.

1021212220201 is a deficient number, since it is larger than the sum of its proper divisors (22120556159).

1021212220201 is an equidigital number, since it uses as much as digits as its factorization.

1021212220201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118291883.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1021212220201 its reverse (1020222121201), we get a palindrome (2041434341402).

The spelling of 1021212220201 in words is "one trillion, twenty-one billion, two hundred twelve million, two hundred twenty thousand, two hundred one".