20011221041 has 16 divisors (see below), whose sum is σ = 23081963520. Its totient is φ = 16993987920.

The previous prime is 20011221037. The next prime is 20011221089. The reversal of 20011221041 is 14012211002.

It is a happy number.

It is not a de Polignac number, because 20011221041 - 2² = 20011221037 is a prime.

It is a super-2 number, since 2×20011221041² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20011229041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 456800 + ... + 498686.

It is an arithmetic number, because the mean of its divisors is an integer number (1442622720).

Almost surely, 2^20011221041 is an apocalyptic number.

It is an amenable number.

20011221041 is a deficient number, since it is larger than the sum of its proper divisors (3070742479).

20011221041 is a wasteful number, since it uses less digits than its factorization.

20011221041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42524.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20011221041 its reverse (14012211002), we get a palindrome (34023432043).

The spelling of 20011221041 in words is "twenty billion, eleven million, two hundred twenty-one thousand, forty-one".