21022120102001 has 4 divisors (see below), whose sum is σ = 21059065832100. Its totient is φ = 20985174371904.

The previous prime is 21022120101971. The next prime is 21022120102013. The reversal of 21022120102001 is 10020102122012.

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 13249956722401 + 7772163379600 = 3640049^2 + 2787860^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21022120102001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21022120102051) 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, 18472864196 + ... + 18472865333.

It is an arithmetic number, because the mean of its divisors is an integer number (5264766458025).

Almost surely, 2^{21022120102001} is an apocalyptic number.

It is an amenable number.

21022120102001 is a deficient number, since it is larger than the sum of its proper divisors (36945730099).

21022120102001 is an equidigital number, since it uses as much as digits as its factorization.

21022120102001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36945730098.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21022120102001 its reverse (10020102122012), we get a palindrome (31042222224013).

The spelling of 21022120102001 in words is "twenty-one trillion, twenty-two billion, one hundred twenty million, one hundred two thousand, one".