20021441111 has 12 divisors (see below), whose sum is σ = 23345857080. Its totient is φ = 17120260080.

The previous prime is 20021441057. The next prime is 20021441117. The reversal of 20021441111 is 11114412002.

It is a de Polignac number, because none of the positive numbers 2^k-20021441111 is a prime.

It is a super-2 number, since 2×20021441111² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20021441111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021441117) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 467060 + ... + 508121.

It is an arithmetic number, because the mean of its divisors is an integer number (1945488090).

Almost surely, 2^20021441111 is an apocalyptic number.

20021441111 is a deficient number, since it is larger than the sum of its proper divisors (3324415969).

20021441111 is an equidigital number, since it uses as much as digits as its factorization.

20021441111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 975614 (or 975607 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20021441111 its reverse (11114412002), we get a palindrome (31135853113).

The spelling of 20021441111 in words is "twenty billion, twenty-one million, four hundred forty-one thousand, one hundred eleven".