201201010021 has 4 divisors (see below), whose sum is σ = 219492010944. Its totient is φ = 182910009100.

The previous prime is 201201010019. The next prime is 201201010037. The reversal of 201201010021 is 120010102102.

201201010021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 201201010021 - 2¹ = 201201010019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201201010421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9145500445 + ... + 9145500466.

It is an arithmetic number, because the mean of its divisors is an integer number (54873002736).

Almost surely, 2^201201010021 is an apocalyptic number.

It is an amenable number.

201201010021 is a deficient number, since it is larger than the sum of its proper divisors (18291000923).

201201010021 is a wasteful number, since it uses less digits than its factorization.

201201010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18291000922.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 201201010021 its reverse (120010102102), we get a palindrome (321211112123).

The spelling of 201201010021 in words is "two hundred one billion, two hundred one million, ten thousand, twenty-one".