201021210202021 has 8 divisors (see below), whose sum is σ = 219296002976064. Its totient is φ = 182746440311520.

The previous prime is 201021210201983. The next prime is 201021210202027. The reversal of 201021210202021 is 120202012120102.

It is a happy number.

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 201021210202021 - 2²¹ = 201021208104869 is a prime.

It is a super-2 number, since 2×201021210202021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201021210201986 and 201021210202004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021210202027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16348345 + ... + 25871041.

It is an arithmetic number, because the mean of its divisors is an integer number (27412000372008).

Almost surely, 2^{201021210202021} is an apocalyptic number.

It is an amenable number.

201021210202021 is a deficient number, since it is larger than the sum of its proper divisors (18274792774043).

201021210202021 is a wasteful number, since it uses less digits than its factorization.

201021210202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11441771.

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

Adding to 201021210202021 its reverse (120202012120102), we get a palindrome (321223222322123).

The spelling of 201021210202021 in words is "two hundred one trillion, twenty-one billion, two hundred ten million, two hundred two thousand, twenty-one".