21011022120001 has 4 divisors (see below), whose sum is σ = 21011644278612. Its totient is φ = 21010399961392.

The previous prime is 21011022119959. The next prime is 21011022120017. The reversal of 21011022120001 is 10002122011012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16186146286401 + 4824875833600 = 4023201^2 + 2196560^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21011022120001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21011022120091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 311028646 + ... + 311096191.

It is an arithmetic number, because the mean of its divisors is an integer number (5252911069653).

Almost surely, 2^{21011022120001} is an apocalyptic number.

It is an amenable number.

21011022120001 is a deficient number, since it is larger than the sum of its proper divisors (622158611).

21011022120001 is an equidigital number, since it uses as much as digits as its factorization.

21011022120001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622158610.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21011022120001 its reverse (10002122011012), we get a palindrome (31013144131013).

The spelling of 21011022120001 in words is "twenty-one trillion, eleven billion, twenty-two million, one hundred twenty thousand, one".