201311220021 has 8 divisors (see below), whose sum is σ = 268422656544. Its totient is φ = 134203631760.

The previous prime is 201311219999. The next prime is 201311220073. The reversal of 201311220021 is 120022113102.

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

It is not a de Polignac number, because 201311220021 - 2⁶ = 201311219957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201311220221) 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, 837706 + ... + 1050891.

It is an arithmetic number, because the mean of its divisors is an integer number (33552832068).

Almost surely, 2^201311220021 is an apocalyptic number.

It is an amenable number.

201311220021 is a deficient number, since it is larger than the sum of its proper divisors (67111436523).

201311220021 is a wasteful number, since it uses less digits than its factorization.

201311220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1924131.

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

Adding to 201311220021 its reverse (120022113102), we get a palindrome (321333333123).

The spelling of 201311220021 in words is "two hundred one billion, three hundred eleven million, two hundred twenty thousand, twenty-one".