20000021111 has 8 divisors (see below), whose sum is σ = 23083476384. Its totient is φ = 16973143200.

The previous prime is 20000021051. The next prime is 20000021137. The reversal of 20000021111 is 11112000002.

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 20000021111 - 2³⁰ = 18926279287 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 (20000021141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14143580 + ... + 14144993.

It is an arithmetic number, because the mean of its divisors is an integer number (2885434548).

Almost surely, 2^20000021111 is an apocalyptic number.

20000021111 is a deficient number, since it is larger than the sum of its proper divisors (3083455273).

20000021111 is a wasteful number, since it uses less digits than its factorization.

20000021111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28288681.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 20000021111 its reverse (11112000002), we get a palindrome (31112021113).

It can be divided in two parts, 2000002 and 1111, that multiplied together give a palindrome (2222002222).

The spelling of 20000021111 in words is "twenty billion, twenty-one thousand, one hundred eleven".