201342231021 has 4 divisors (see below), whose sum is σ = 268456308032. Its totient is φ = 134228154012.

The previous prime is 201342231017. The next prime is 201342231023. The reversal of 201342231021 is 120132243102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 201342231021 - 2² = 201342231017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201342231023) 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, 33557038501 + ... + 33557038506.

It is an arithmetic number, because the mean of its divisors is an integer number (67114077008).

Almost surely, 2^201342231021 is an apocalyptic number.

It is an amenable number.

201342231021 is a deficient number, since it is larger than the sum of its proper divisors (67114077011).

201342231021 is an equidigital number, since it uses as much as digits as its factorization.

201342231021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67114077010.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 201342231021 its reverse (120132243102), we get a palindrome (321474474123).

The spelling of 201342231021 in words is "two hundred one billion, three hundred forty-two million, two hundred thirty-one thousand, twenty-one".