21312321210001 has 4 divisors (see below), whose sum is σ = 21314396219904. Its totient is φ = 21310246200100.

The previous prime is 21312321209929. The next prime is 21312321210017. The reversal of 21312321210001 is 10001212321312.

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 a cyclic number.

It is not a de Polignac number, because 21312321210001 - 2⁹ = 21312321209489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21312321210601) 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, 1037489545 + ... + 1037510086.

It is an arithmetic number, because the mean of its divisors is an integer number (5328599054976).

Almost surely, 2^{21312321210001} is an apocalyptic number.

It is an amenable number.

21312321210001 is a deficient number, since it is larger than the sum of its proper divisors (2075009903).

21312321210001 is a wasteful number, since it uses less digits than its factorization.

21312321210001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2075009902.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21312321210001 its reverse (10001212321312), we get a palindrome (31313533531313).

The spelling of 21312321210001 in words is "twenty-one trillion, three hundred twelve billion, three hundred twenty-one million, two hundred ten thousand, one".