2021021201 has 4 divisors (see below), whose sum is σ = 2108891712.
Its totient is φ = 1933150692.
The previous prime is 2021021147. The next prime is 2021021207. The reversal of 2021021201 is 1021201202.
It is a happy number.
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 2021021201 - 218 = 2020759057 is a prime.
It is not an unprimeable number, because it can be changed into a prime (2021021207) 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, 43935221 + ... + 43935266.
It is an arithmetic number, because the mean of its divisors is an integer number (527222928).
Almost surely, 22021021201 is an apocalyptic number.
It is an amenable number.
2021021201 is a deficient number, since it is larger than the sum of its proper divisors (87870511).
2021021201 is an equidigital number, since it uses as much as digits as its factorization.
2021021201 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 87870510.
The product of its (nonzero) digits is 16, while the sum is 11.
The square root of 2021021201 is about 44955.7693850300.
The cubic root of 2021021201 is about 1264.3198499653.
Adding to 2021021201 its reverse (1021201202), we get a palindrome (3042222403).
It can be divided in two parts, 202 and 1021201, that multiplied together give a palindrome (206282602).
The spelling of 2021021201 in words is "two billion, twenty-one million, twenty-one thousand, two hundred one".