22020001001221 has 4 divisors (see below), whose sum is σ = 22020936493600. Its totient is φ = 22019065508844.

The previous prime is 22020001001203. The next prime is 22020001001239. The reversal of 22020001001221 is 12210010002022.

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 an interprime number because it is at equal distance from previous prime (22020001001203) and next prime (22020001001239).

It is a cyclic number.

It is not a de Polignac number, because 22020001001221 - 2⁴¹ = 19820977745669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22020001001821) 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, 467710881 + ... + 467757958.

It is an arithmetic number, because the mean of its divisors is an integer number (5505234123400).

Almost surely, 2^{22020001001221} is an apocalyptic number.

It is an amenable number.

22020001001221 is a deficient number, since it is larger than the sum of its proper divisors (935492379).

22020001001221 is an equidigital number, since it uses as much as digits as its factorization.

22020001001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935492378.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 22020001001221 its reverse (12210010002022), we get a palindrome (34230011003243).

The spelling of 22020001001221 in words is "twenty-two trillion, twenty billion, one million, one thousand, two hundred twenty-one".