201021222121111 has 16 divisors (see below), whose sum is σ = 234429484680000. Its totient is φ = 172302138111264.

The previous prime is 201021222121091. The next prime is 201021222121129. The reversal of 201021222121111 is 111121222120102.

It is a happy number.

It is not a de Polignac number, because 201021222121111 - 2⁹ = 201021222120599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021222121171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31061565 + ... + 36971113.

It is an arithmetic number, because the mean of its divisors is an integer number (14651842792500).

Almost surely, 2^{201021222121111} is an apocalyptic number.

201021222121111 is a deficient number, since it is larger than the sum of its proper divisors (33408262558889).

201021222121111 is an frugal number, since it uses more digits than its factorization.

201021222121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6008743 (or 6008729 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 201021222121111 its reverse (111121222120102), we get a palindrome (312142444241213).

The spelling of 201021222121111 in words is "two hundred one trillion, twenty-one billion, two hundred twenty-two million, one hundred twenty-one thousand, one hundred eleven".