201021100110021 has 8 divisors (see below), whose sum is σ = 269416880286400. Its totient is φ = 133319693336832.

The previous prime is 201021100109957. The next prime is 201021100110073. The reversal of 201021100110021 is 120011001120102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 201021100110021 - 2⁶ = 201021100109957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201021100109979 and 201021100110006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021100110221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 173593350121 + ... + 173593351278.

It is an arithmetic number, because the mean of its divisors is an integer number (33677110035800).

Almost surely, 2^{201021100110021} is an apocalyptic number.

It is an amenable number.

201021100110021 is a deficient number, since it is larger than the sum of its proper divisors (68395780176379).

201021100110021 is a wasteful number, since it uses less digits than its factorization.

201021100110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347186701595.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 201021100110021 its reverse (120011001120102), we get a palindrome (321032101230123).

The spelling of 201021100110021 in words is "two hundred one trillion, twenty-one billion, one hundred million, one hundred ten thousand, twenty-one".