201221210021011 has 4 divisors (see below), whose sum is σ = 201224407167000. Its totient is φ = 201218012875024.

The previous prime is 201221210020933. The next prime is 201221210021081. The reversal of 201221210021011 is 110120012122102.

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 201221210021011 - 2¹³ = 201221210012819 is a prime.

It is a super-2 number, since 2×201221210021011² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201221210021081) 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, 1598478586 + ... + 1598604463.

It is an arithmetic number, because the mean of its divisors is an integer number (50306101791750).

Almost surely, 2^{201221210021011} is an apocalyptic number.

201221210021011 is a deficient number, since it is larger than the sum of its proper divisors (3197145989).

201221210021011 is an equidigital number, since it uses as much as digits as its factorization.

201221210021011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3197145988.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 201221210021011 its reverse (110120012122102), we get a palindrome (311341222143113).

The spelling of 201221210021011 in words is "two hundred one trillion, two hundred twenty-one billion, two hundred ten million, twenty-one thousand, eleven".