201021201021 has 32 divisors (see below), whose sum is σ = 278179341696. Its totient is φ = 129016800000.

The previous prime is 201021201019. The next prime is 201021201137. The reversal of 201021201021 is 120102120102.

It is not a de Polignac number, because 201021201021 - 2¹ = 201021201019 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 201021200988 and 201021201006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021201721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20298171 + ... + 20308071.

It is an arithmetic number, because the mean of its divisors is an integer number (8693104428).

Almost surely, 2^201021201021 is an apocalyptic number.

It is an amenable number.

201021201021 is a deficient number, since it is larger than the sum of its proper divisors (77158140675).

201021201021 is a wasteful number, since it uses less digits than its factorization.

201021201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11853.

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

Adding to 201021201021 its reverse (120102120102), we get a palindrome (321123321123).

It can be divided in two parts, 20102 and 1201021, that multiplied together give a palindrome (24142924142).

The spelling of 201021201021 in words is "two hundred one billion, twenty-one million, two hundred one thousand, twenty-one".