21302122221001 has 4 divisors (see below), whose sum is σ = 21521731728532. Its totient is φ = 21082512713472.

The previous prime is 21302122220971. The next prime is 21302122221013. The reversal of 21302122221001 is 10012222120312.

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 3909719244601 + 17392402976400 = 1977301^2 + 4170420^2 .

It is a cyclic number.

It is not a de Polignac number, because 21302122221001 - 2²⁷ = 21301988003273 is a prime.

It is a super-2 number, since 2×21302122221001² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21302122221001.

It is not an unprimeable number, because it can be changed into a prime (21302122221031) 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, 109804753620 + ... + 109804753813.

It is an arithmetic number, because the mean of its divisors is an integer number (5380432932133).

Almost surely, 2^{21302122221001} is an apocalyptic number.

It is an amenable number.

21302122221001 is a deficient number, since it is larger than the sum of its proper divisors (219609507531).

21302122221001 is an equidigital number, since it uses as much as digits as its factorization.

21302122221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219609507530.

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

Adding to 21302122221001 its reverse (10012222120312), we get a palindrome (31314344341313).

The spelling of 21302122221001 in words is "twenty-one trillion, three hundred two billion, one hundred twenty-two million, two hundred twenty-one thousand, one".