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21201021002 = 272216336949
BaseRepresentation
bin10011101111101011…
…011110100001001010
32000201112110110100002
4103233223132201022
5321404430133002
613423431243002
71350244463600
oct235753364112
960645413302
1021201021002
118a9a472967
124138219462
131ccb468a55
1410519dd870
15841409002
hex4efade84a

21201021002 has 12 divisors (see below), whose sum is σ = 36993618450. Its totient is φ = 9086151816.

The previous prime is 21201020927. The next prime is 21201021007. The reversal of 21201021002 is 20012010212.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20969646481 + 231374521 = 144809^2 + 15211^2 .

It is not an unprimeable number, because it can be changed into a prime (21201021007) 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, 108168377 + ... + 108168572.

Almost surely, 221201021002 is an apocalyptic number.

21201021002 is a deficient number, since it is larger than the sum of its proper divisors (15792597448).

21201021002 is a wasteful number, since it uses less digits than its factorization.

21201021002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216336965 (or 216336958 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21201021002 its reverse (20012010212), we get a palindrome (41213031214).

The spelling of 21201021002 in words is "twenty-one billion, two hundred one million, twenty-one thousand, two".

Divisors: 1 2 7 14 49 98 216336949 432673898 1514358643 3028717286 10600510501 21201021002