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21011002031 is a prime number
BaseRepresentation
bin10011100100010110…
…100111001010101111
32000020021220111022102
4103210112213022233
5321012304031111
613352522405315
71342446366455
oct234426471257
960207814272
1021011002031
118a02187898
1240a466083b
131c9ac977a6
1410346989d5
1582e8c213b
hex4e45a72af

21011002031 has 2 divisors, whose sum is σ = 21011002032. Its totient is φ = 21011002030.

The previous prime is 21011001989. The next prime is 21011002043. The reversal of 21011002031 is 13020011012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21011002031 - 218 = 21010739887 is a prime.

It is a super-2 number, since 2×210110020312 (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21011002231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505501015 + 10505501016.

It is an arithmetic number, because the mean of its divisors is an integer number (10505501016).

Almost surely, 221011002031 is an apocalyptic number.

21011002031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011002031 is an equidigital number, since it uses as much as digits as its factorization.

21011002031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 21011002031 its reverse (13020011012), we get a palindrome (34031013043).

The spelling of 21011002031 in words is "twenty-one billion, eleven million, two thousand, thirty-one".