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20123211021 = 342120837649
BaseRepresentation
bin10010101111011011…
…111101010100001101
31220221102101000222220
4102233123331110031
5312203020223041
613124450125553
71311446320464
oct225733752415
956842330886
1020123211021
118597034311
123a972808b9
131b89087274
14d8c7d99db
157cb9a7d66
hex4af6fd50d

20123211021 has 16 divisors (see below), whose sum is σ = 26911108800. Its totient is φ = 13375434240.

The previous prime is 20123211019. The next prime is 20123211029. The reversal of 20123211021 is 12011232102.

Adding to 20123211021 its reverse (12011232102), we get a palindrome (32134443123).

It is not a de Polignac number, because 20123211021 - 21 = 20123211019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123211029) 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, 2627005 + ... + 2634653.

It is an arithmetic number, because the mean of its divisors is an integer number (1681944300).

Almost surely, 220123211021 is an apocalyptic number.

It is an amenable number.

20123211021 is a deficient number, since it is larger than the sum of its proper divisors (6787897779).

20123211021 is a wasteful number, since it uses less digits than its factorization.

20123211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10156.

The product of its (nonzero) digits is 48, while the sum is 15.

The spelling of 20123211021 in words is "twenty billion, one hundred twenty-three million, two hundred eleven thousand, twenty-one".

Divisors: 1 3 421 1263 2083 6249 7649 22947 876943 2630829 3220229 9660687 15932867 47798601 6707737007 20123211021