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21021045321 = 37007015107
BaseRepresentation
bin10011100100111100…
…111011001001001001
32000020222210202010010
4103210330323021021
5321022341422241
613353521542133
71342630636263
oct234474731111
960228722103
1021021045321
118a07917531
1240a7aa4949
131ca00a2c73
141035b50b33
15830707d16
hex4e4f3b249

21021045321 has 4 divisors (see below), whose sum is σ = 28028060432. Its totient is φ = 14014030212.

The previous prime is 21021045313. The next prime is 21021045373. The reversal of 21021045321 is 12354012012.

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 not a de Polignac number, because 21021045321 - 23 = 21021045313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021047321) 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, 3503507551 + ... + 3503507556.

It is an arithmetic number, because the mean of its divisors is an integer number (7007015108).

Almost surely, 221021045321 is an apocalyptic number.

It is an amenable number.

21021045321 is a deficient number, since it is larger than the sum of its proper divisors (7007015111).

21021045321 is an equidigital number, since it uses as much as digits as its factorization.

21021045321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7007015110.

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 21021045321 its reverse (12354012012), we get a palindrome (33375057333).

The spelling of 21021045321 in words is "twenty-one billion, twenty-one million, forty-five thousand, three hundred twenty-one".

Divisors: 1 3 7007015107 21021045321