201020001110021 has 4 divisors (see below), whose sum is σ = 201020241021600. Its totient is φ = 201019761198444.

The previous prime is 201020001110017. The next prime is 201020001110023. The reversal of 201020001110021 is 120011100020102.

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 201020001110021 - 2² = 201020001110017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201020001109984 and 201020001110011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201020001110023) 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, 118694531 + ... + 120376208.

It is an arithmetic number, because the mean of its divisors is an integer number (50255060255400).

Almost surely, 2^{201020001110021} is an apocalyptic number.

It is an amenable number.

201020001110021 is a deficient number, since it is larger than the sum of its proper divisors (239911579).

201020001110021 is an equidigital number, since it uses as much as digits as its factorization.

201020001110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239911578.

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

Adding to 201020001110021 its reverse (120011100020102), we get a palindrome (321031101130123).

The spelling of 201020001110021 in words is "two hundred one trillion, twenty billion, one million, one hundred ten thousand, twenty-one".