21202022212001 has 4 divisors (see below), whose sum is σ = 21457468262832. Its totient is φ = 20946576161172.

The previous prime is 21202022211989. The next prime is 21202022212069. The reversal of 21202022212001 is 10021222020212.

It is a happy number.

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 not a de Polignac number, because 21202022212001 - 2³⁸ = 20927144305057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21202022214001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127723025291 + ... + 127723025456.

It is an arithmetic number, because the mean of its divisors is an integer number (5364367065708).

Almost surely, 2^{21202022212001} is an apocalyptic number.

It is an amenable number.

21202022212001 is a deficient number, since it is larger than the sum of its proper divisors (255446050831).

21202022212001 is an equidigital number, since it uses as much as digits as its factorization.

21202022212001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255446050830.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21202022212001 its reverse (10021222020212), we get a palindrome (31223244232213).

The spelling of 21202022212001 in words is "twenty-one trillion, two hundred two billion, twenty-two million, two hundred twelve thousand, one".