201021211001 has 4 divisors (see below), whose sum is σ = 216484381092. Its totient is φ = 185558040912.

The previous prime is 201021210977. The next prime is 201021211033. The reversal of 201021211001 is 100112120102.

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 17935637776 + 183085573225 = 133924^2 + 427885^2 .

It is a cyclic number.

It is not a de Polignac number, because 201021211001 - 2³⁰ = 199947469177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201021211051) 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, 7731585026 + ... + 7731585051.

It is an arithmetic number, because the mean of its divisors is an integer number (54121095273).

Almost surely, 2^201021211001 is an apocalyptic number.

It is an amenable number.

201021211001 is a deficient number, since it is larger than the sum of its proper divisors (15463170091).

201021211001 is a wasteful number, since it uses less digits than its factorization.

201021211001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15463170090.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 201021211001 its reverse (100112120102), we get a palindrome (301133331103).

The spelling of 201021211001 in words is "two hundred one billion, twenty-one million, two hundred eleven thousand, one".