202311201421 has 6 divisors (see below), whose sum is σ = 235341601710. Its totient is φ = 173409601176.

The previous prime is 202311201413. The next prime is 202311201467. The reversal of 202311201421 is 124102113202.

It can be written as a sum of positive squares in only one way, i.e., 117097418025 + 85213783396 = 342195^2 + 291914^2 .

It is not a de Polignac number, because 202311201421 - 2³ = 202311201413 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 (202311201481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2064399966 + ... + 2064400063.

It is an arithmetic number, because the mean of its divisors is an integer number (39223600285).

Almost surely, 2^202311201421 is an apocalyptic number.

It is an amenable number.

202311201421 is a deficient number, since it is larger than the sum of its proper divisors (33030400289).

202311201421 is an equidigital number, since it uses as much as digits as its factorization.

202311201421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4128800043 (or 4128800036 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 202311201421 its reverse (124102113202), we get a palindrome (326413314623).

The spelling of 202311201421 in words is "two hundred two billion, three hundred eleven million, two hundred one thousand, four hundred twenty-one".