201021221212021 has 8 divisors (see below), whose sum is σ = 229738633601984. Its totient is φ = 172303832590560.

The previous prime is 201021221211983. The next prime is 201021221212139. The reversal of 201021221212021 is 120212122120102.

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 201021221212021 - 2⁷ = 201021221211893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 201021221212021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021221215021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19368361 + ... + 27877873.

It is an arithmetic number, because the mean of its divisors is an integer number (28717329200248).

Almost surely, 2^{201021221212021} is an apocalyptic number.

It is an amenable number.

201021221212021 is a deficient number, since it is larger than the sum of its proper divisors (28717412389963).

201021221212021 is an equidigital number, since it uses as much as digits as its factorization.

201021221212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11884251.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 201021221212021 its reverse (120212122120102), we get a palindrome (321233343332123).

The spelling of 201021221212021 in words is "two hundred one trillion, twenty-one billion, two hundred twenty-one million, two hundred twelve thousand, twenty-one".