201021210001111 has 4 divisors (see below), whose sum is σ = 211601273685400. Its totient is φ = 190441146316824.

The previous prime is 201021210001097. The next prime is 201021210001169. The reversal of 201021210001111 is 111100012120102.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 201021210001111 - 2⁴⁷ = 60283721645783 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201021210001091 and 201021210001100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021210301111) 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, 5290031842116 + ... + 5290031842153.

It is an arithmetic number, because the mean of its divisors is an integer number (52900318421350).

Almost surely, 2^{201021210001111} is an apocalyptic number.

201021210001111 is a deficient number, since it is larger than the sum of its proper divisors (10580063684289).

201021210001111 is a wasteful number, since it uses less digits than its factorization.

201021210001111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10580063684288.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 201021210001111 its reverse (111100012120102), we get a palindrome (312121222121213).

The spelling of 201021210001111 in words is "two hundred one trillion, twenty-one billion, two hundred ten million, one thousand, one hundred eleven".