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21011002 = 253379523
BaseRepresentation
bin101000000100…
…1101000111010
31110112110200021
41100021220322
520334323002
62030201054
7343406365
oct120115072
943473607
1021011002
1110950971
12705318a
13447865c
142b0d0dc
151ca0737
hex1409a3a

21011002 has 16 divisors (see below), whose sum is σ = 32257440. Its totient is φ = 10260432.

The previous prime is 21010987. The next prime is 21011009. The reversal of 21011002 is 20011012.

It is not an unprimeable number, because it can be changed into a prime (21011009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39913 + ... + 40435.

It is an arithmetic number, because the mean of its divisors is an integer number (2016090).

Almost surely, 221011002 is an apocalyptic number.

21011002 is a deficient number, since it is larger than the sum of its proper divisors (11246438).

21011002 is a wasteful number, since it uses less digits than its factorization.

21011002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 957.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 21011002 is about 4583.7759543852. The cubic root of 21011002 is about 275.9405896770.

Adding to 21011002 its reverse (20011012), we get a palindrome (41022014).

The spelling of 21011002 in words is "twenty-one million, eleven thousand, two".

Divisors: 1 2 53 106 379 523 758 1046 20087 27719 40174 55438 198217 396434 10505501 21011002