20121222021 has 8 divisors (see below), whose sum is σ = 26828967744. Its totient is φ = 13413812160.

The previous prime is 20121222001. The next prime is 20121222041. The reversal of 20121222021 is 12022212102.

It is an interprime number because it is at equal distance from previous prime (20121222001) and next prime (20121222041).

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

It is not a de Polignac number, because 20121222021 - 2⁹ = 20121221509 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121222001) 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, 145101 + ... + 247581.

It is an arithmetic number, because the mean of its divisors is an integer number (3353620968).

Almost surely, 2^20121222021 is an apocalyptic number.

It is an amenable number.

20121222021 is a deficient number, since it is larger than the sum of its proper divisors (6707745723).

20121222021 is a wasteful number, since it uses less digits than its factorization.

20121222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167931.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 20121222021 its reverse (12022212102), we get a palindrome (32143434123).

The spelling of 20121222021 in words is "twenty billion, one hundred twenty-one million, two hundred twenty-two thousand, twenty-one".