201221331020231 has 16 divisors (see below), whose sum is σ = 213242544956448. Its totient is φ = 189220641868800.

The previous prime is 201221331020209. The next prime is 201221331020233. The reversal of 201221331020231 is 132020133122102.

It is a cyclic number.

It is not a de Polignac number, because 201221331020231 - 2¹⁸ = 201221330758087 is a prime.

It is a super-2 number, since 2×201221331020231² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201221331020197 and 201221331020206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201221331020233) 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, 1982171531 + ... + 1982273043.

It is an arithmetic number, because the mean of its divisors is an integer number (13327659059778).

Almost surely, 2^{201221331020231} is an apocalyptic number.

201221331020231 is a deficient number, since it is larger than the sum of its proper divisors (12021213936217).

201221331020231 is a wasteful number, since it uses less digits than its factorization.

201221331020231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201442.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 201221331020231 its reverse (132020133122102), we get a palindrome (333241464142333).

The spelling of 201221331020231 in words is "two hundred one trillion, two hundred twenty-one billion, three hundred thirty-one million, twenty thousand, two hundred thirty-one".