201021102021 has 16 divisors (see below), whose sum is σ = 270378444800. Its totient is φ = 132840787968.

The previous prime is 201021101971. The next prime is 201021102067. The reversal of 201021102021 is 120201120102.

It is not a de Polignac number, because 201021102021 - 2⁷ = 201021101893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201021101988 and 201021102006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021102721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196485 + ... + 663813.

It is an arithmetic number, because the mean of its divisors is an integer number (16898652800).

Almost surely, 2^201021102021 is an apocalyptic number.

It is an amenable number.

201021102021 is a deficient number, since it is larger than the sum of its proper divisors (69357342779).

201021102021 is a wasteful number, since it uses less digits than its factorization.

201021102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468588.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 201021102021 its reverse (120201120102), we get a palindrome (321222222123).

The spelling of 201021102021 in words is "two hundred one billion, twenty-one million, one hundred two thousand, twenty-one".