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20011221111 = 371187802793
BaseRepresentation
bin10010101000110000…
…110000000001110111
31220122121122100201110
4102220300300001313
5311440333033421
613105405530103
71305616400340
oct225060600167
956577570643
1020011221111
1185398a3672
123a65873933
131b6bb0624b
14d7b9a70c7
157c1c35a76
hex4a8c30077

20011221111 has 16 divisors (see below), whose sum is σ = 30519016704. Its totient is φ = 11425335744.

The previous prime is 20011221107. The next prime is 20011221127. The reversal of 20011221111 is 11112211002.

It is not a de Polignac number, because 20011221111 - 22 = 20011221107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011221311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 376470 + ... + 426323.

It is an arithmetic number, because the mean of its divisors is an integer number (1907438544).

Almost surely, 220011221111 is an apocalyptic number.

20011221111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20011221111 is a deficient number, since it is larger than the sum of its proper divisors (10507795593).

20011221111 is a wasteful number, since it uses less digits than its factorization.

20011221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803990.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 20011221111 its reverse (11112211002), we get a palindrome (31123432113).

The spelling of 20011221111 in words is "twenty billion, eleven million, two hundred twenty-one thousand, one hundred eleven".

Divisors: 1 3 7 21 1187 3561 8309 24927 802793 2408379 5619551 16858653 952915291 2858745873 6670407037 20011221111