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20000021011 = 5327119979
BaseRepresentation
bin10010101000000110…
…000001101000010011
31220121211120100001221
4102220012001220103
5311430001133021
613104325505511
71305422242105
oct225006015023
956554510057
1020000021011
118533543893
123a61b72297
131b696b4379
14d7a2cd575
157c0c72241
hex4a8181a13

20000021011 has 6 divisors (see below), whose sum is σ = 20384502740. Its totient is φ = 19622659368.

The previous prime is 20000021009. The next prime is 20000021023. The reversal of 20000021011 is 11012000002.

It is not a de Polignac number, because 20000021011 - 21 = 20000021009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20000020985 and 20000021003.

It is not an unprimeable number, because it can be changed into a prime (20000021051) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3557181 + ... + 3562798.

Almost surely, 220000021011 is an apocalyptic number.

20000021011 is a deficient number, since it is larger than the sum of its proper divisors (384481729).

20000021011 is an frugal number, since it uses more digits than its factorization.

20000021011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7120085 (or 7120032 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 20000021011 its reverse (11012000002), we get a palindrome (31012021013).

The spelling of 20000021011 in words is "twenty billion, twenty-one thousand, eleven".

Divisors: 1 53 2809 7119979 377358887 20000021011