21342201321 has 12 divisors (see below), whose sum is σ = 33102190032. Its totient is φ = 12195543528.

The previous prime is 21342201289. The next prime is 21342201323. The reversal of 21342201321 is 12310224312.

It is not a de Polignac number, because 21342201321 - 2⁵ = 21342201289 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21342201323) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72592375 + ... + 72592668.

It is an arithmetic number, because the mean of its divisors is an integer number (2758515836).

Almost surely, 2^21342201321 is an apocalyptic number.

21342201321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21342201321 is a deficient number, since it is larger than the sum of its proper divisors (11759988711).

21342201321 is a wasteful number, since it uses less digits than its factorization.

21342201321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145185060 (or 145185053 counting only the distinct ones).

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

Adding to 21342201321 its reverse (12310224312), we get a palindrome (33652425633).

The spelling of 21342201321 in words is "twenty-one billion, three hundred forty-two million, two hundred one thousand, three hundred twenty-one".