201021102001 has 4 divisors (see below), whose sum is σ = 201022319092. Its totient is φ = 201019884912.

The previous prime is 201021101971. The next prime is 201021102067. The reversal of 201021102001 is 100201120102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 120010280625 + 81010821376 = 346425^2 + 284624^2 .

It is a cyclic number.

It is not a de Polignac number, because 201021102001 - 2¹¹ = 201021099953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201021102101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 312930 + ... + 707083.

It is an arithmetic number, because the mean of its divisors is an integer number (50255579773).

Almost surely, 2^201021102001 is an apocalyptic number.

It is an amenable number.

201021102001 is a deficient number, since it is larger than the sum of its proper divisors (1217091).

201021102001 is a wasteful number, since it uses less digits than its factorization.

201021102001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1217090.

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

Adding to 201021102001 its reverse (100201120102), we get a palindrome (301222222103).

The spelling of 201021102001 in words is "two hundred one billion, twenty-one million, one hundred two thousand, one".