21020222221001 has 4 divisors (see below), whose sum is σ = 21020253270912. Its totient is φ = 21020191171092.

The previous prime is 21020222220983. The next prime is 21020222221007. The reversal of 21020222221001 is 10012222202012.

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 a cyclic number.

It is not a de Polignac number, because 21020222221001 - 2⁶ = 21020222220937 is a prime.

It is a super-3 number, since 3×21020222221001³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21020222221007) 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, 14486321 + ... + 15871166.

It is an arithmetic number, because the mean of its divisors is an integer number (5255063317728).

Almost surely, 2^{21020222221001} is an apocalyptic number.

It is an amenable number.

21020222221001 is a deficient number, since it is larger than the sum of its proper divisors (31049911).

21020222221001 is an equidigital number, since it uses as much as digits as its factorization.

21020222221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31049910.

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

Adding to 21020222221001 its reverse (10012222202012), we get a palindrome (31032444423013).

The spelling of 21020222221001 in words is "twenty-one trillion, twenty billion, two hundred twenty-two million, two hundred twenty-one thousand, one".