202421201021 has 8 divisors (see below), whose sum is σ = 217996026360. Its totient is φ = 186846941952.

The previous prime is 202421200997. The next prime is 202421201023. The reversal of 202421201021 is 120102124202.

It can be written as a sum of positive squares in 4 ways, for example, as 17275159225 + 185146041796 = 131435^2 + 430286^2 .

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 202421201021 - 2¹⁸ = 202420938877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202421201023) 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, 867065 + ... + 1075473.

It is an arithmetic number, because the mean of its divisors is an integer number (27249503295).

Almost surely, 2^202421201021 is an apocalyptic number.

It is an amenable number.

202421201021 is a deficient number, since it is larger than the sum of its proper divisors (15574825339).

202421201021 is a wasteful number, since it uses less digits than its factorization.

202421201021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283135.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 202421201021 its reverse (120102124202), we get a palindrome (322523325223).

The spelling of 202421201021 in words is "two hundred two billion, four hundred twenty-one million, two hundred one thousand, twenty-one".