201221020311 has 8 divisors (see below), whose sum is σ = 272692967664. Its totient is φ = 131948209920.

The previous prime is 201221020291. The next prime is 201221020327. The reversal of 201221020311 is 113020122102.

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

It is not a de Polignac number, because 201221020311 - 2⁹ = 201221019799 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201221020331) 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, 549784026 + ... + 549784391.

It is an arithmetic number, because the mean of its divisors is an integer number (34086620958).

Almost surely, 2^201221020311 is an apocalyptic number.

201221020311 is a deficient number, since it is larger than the sum of its proper divisors (71471947353).

201221020311 is a wasteful number, since it uses less digits than its factorization.

201221020311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1099568481.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 201221020311 its reverse (113020122102), we get a palindrome (314241142413).

The spelling of 201221020311 in words is "two hundred one billion, two hundred twenty-one million, twenty thousand, three hundred eleven".