20012021221 has 8 divisors (see below), whose sum is σ = 20292966720. Its totient is φ = 19731259872.

The previous prime is 20012021203. The next prime is 20012021233. The reversal of 20012021221 is 12212021002.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20012021221 - 2⁷ = 20012021093 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 (20012021261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180600 + ... + 269518.

It is an arithmetic number, because the mean of its divisors is an integer number (2536620840).

Almost surely, 2^20012021221 is an apocalyptic number.

It is an amenable number.

20012021221 is a deficient number, since it is larger than the sum of its proper divisors (280945499).

20012021221 is an equidigital number, since it uses as much as digits as its factorization.

20012021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92075.

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

Adding to 20012021221 its reverse (12212021002), we get a palindrome (32224042223).

The spelling of 20012021221 in words is "twenty billion, twelve million, twenty-one thousand, two hundred twenty-one".