201021210121101 has 4 divisors (see below), whose sum is σ = 268028280161472. Its totient is φ = 134014140080732.

The previous prime is 201021210121093. The next prime is 201021210121111. The reversal of 201021210121101 is 101121012120102.

It is a happy number.

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 201021210121101 - 2³ = 201021210121093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021210121111) 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, 33503535020181 + ... + 33503535020186.

It is an arithmetic number, because the mean of its divisors is an integer number (67007070040368).

Almost surely, 2^{201021210121101} is an apocalyptic number.

It is an amenable number.

201021210121101 is a deficient number, since it is larger than the sum of its proper divisors (67007070040371).

201021210121101 is an equidigital number, since it uses as much as digits as its factorization.

201021210121101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67007070040370.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 201021210121101 its reverse (101121012120102), we get a palindrome (302142222241203).

The spelling of 201021210121101 in words is "two hundred one trillion, twenty-one billion, two hundred ten million, one hundred twenty-one thousand, one hundred one".