201231221101021 has 8 divisors (see below), whose sum is σ = 204016629602880. Its totient is φ = 198446591421792.

The previous prime is 201231221101019. The next prime is 201231221101039. The reversal of 201231221101021 is 120101122132102.

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

It is a cyclic number.

It is not a de Polignac number, because 201231221101021 - 2¹ = 201231221101019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 201231221101021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201231221101321) 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, 194185315 + ... + 195218848.

It is an arithmetic number, because the mean of its divisors is an integer number (25502078700360).

Almost surely, 2^{201231221101021} is an apocalyptic number.

It is an amenable number.

201231221101021 is a deficient number, since it is larger than the sum of its proper divisors (2785408501859).

201231221101021 is an equidigital number, since it uses as much as digits as its factorization.

201231221101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389411315.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 201231221101021 its reverse (120101122132102), we get a palindrome (321332343233123).

The spelling of 201231221101021 in words is "two hundred one trillion, two hundred thirty-one billion, two hundred twenty-one million, one hundred one thousand, twenty-one".