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20233031021 = 72890433003
BaseRepresentation
bin10010110101111110…
…111000110101101101
31221020002000110201022
4102311332320311231
5312414123443041
613143412023525
71314251632430
oct226576706555
957202013638
1020233031021
118643022745
123b08001ba5
131ba5a58708
14d9d225817
157d644c24b
hex4b5fb8d6d

20233031021 has 4 divisors (see below), whose sum is σ = 23123464032. Its totient is φ = 17342598012.

The previous prime is 20233031017. The next prime is 20233031107. The reversal of 20233031021 is 12013033202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20233031021 - 22 = 20233031017 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 (20233030021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1445216495 + ... + 1445216508.

It is an arithmetic number, because the mean of its divisors is an integer number (5780866008).

Almost surely, 220233031021 is an apocalyptic number.

It is an amenable number.

20233031021 is a deficient number, since it is larger than the sum of its proper divisors (2890433011).

20233031021 is an equidigital number, since it uses as much as digits as its factorization.

20233031021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2890433010.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 20233031021 its reverse (12013033202), we get a palindrome (32246064223).

The spelling of 20233031021 in words is "twenty billion, two hundred thirty-three million, thirty-one thousand, twenty-one".

Divisors: 1 7 2890433003 20233031021